* Re: [PATCH 2/3] ext4: add support for 32-bit default reserved uid and gid values
From: Darrick J. Wong @ 2025-09-11 22:31 UTC (permalink / raw)
To: tytso; +Cc: linux-ext4, linux-api
In-Reply-To: <20250908-tune2fs-v1-2-e3a6929f3355@mit.edu>
On Mon, Sep 08, 2025 at 11:15:49PM -0400, Theodore Ts'o via B4 Relay wrote:
> From: Theodore Ts'o <tytso@mit.edu>
>
> Support for specifying the default user id and group id that is
> allowed to use the reserved block space was added way back when Linux
> only supported 16-bit uid's and gid's. (Yeah, that long ago.) It's
> not a commonly used feature, but let's add support for 32-bit user and
> group id's.
>
> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
> ---
> fs/ext4/ext4.h | 16 +++++++++++++++-
> fs/ext4/super.c | 8 ++++----
> 2 files changed, 19 insertions(+), 5 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 01a6e2de7fc3ef0e20b039d3200b9c9bd656f59f..4bfcd5f0c74fda30db4009ee28fbee00a2f6b76f 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1442,7 +1442,9 @@ struct ext4_super_block {
> __le16 s_encoding; /* Filename charset encoding */
> __le16 s_encoding_flags; /* Filename charset encoding flags */
> __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
> - __le32 s_reserved[94]; /* Padding to the end of the block */
> + __le16 s_def_resuid_hi;
> + __le16 s_def_resgid_hi;
> + __le32 s_reserved[93]; /* Padding to the end of the block */
Does anything actually check that s_reserved is zero? I couldn't find
any:
$ git grep -w s_reserved fs/ext4 fs/ext2
fs/ext2/ext2.h:480: __u32 s_reserved[190]; /* Padding to the end of the block */
fs/ext4/ext4.h:1445: __le32 s_reserved[94]; /* Padding to the end of the block */
$ git grep -w s_reserved lib/ext2fs/ e2fsck/
lib/ext2fs/ext2_fs.h:777: __le32 s_reserved[94]; /* Padding to the end of the block */
lib/ext2fs/swapfs.c:135: /* catch when new fields are used from s_reserved */
lib/ext2fs/swapfs.c:136: EXT2FS_BUILD_BUG_ON(sizeof(sb->s_reserved) != 94 * sizeof(__le32));
lib/ext2fs/tst_super_size.c:156: check_field(s_reserved, 94 * 4);
Is there a risk that some garbage written to s_reserved (and not caught
by either the kernel or e2fsck) will now appear as a "legitimate" resuid
value?
--D
> __le32 s_checksum; /* crc32c(superblock) */
> };
>
> @@ -1812,6 +1814,18 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
> ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
> }
>
> +static inline int ext4_get_resuid(struct ext4_super_block *es)
> +{
> + return(le16_to_cpu(es->s_def_resuid) |
> + (le16_to_cpu(es->s_def_resuid_hi) << 16));
> +}
> +
> +static inline int ext4_get_resgid(struct ext4_super_block *es)
> +{
> + return(le16_to_cpu(es->s_def_resgid) |
> + (le16_to_cpu(es->s_def_resgid_hi) << 16));
> +}
> +
> /*
> * Returns: sbi->field[index]
> * Used to access an array element from the following sbi fields which require
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 94c98446c84f9a4614971d246ca7f001de610a8a..0256c8f7c6cee2b8d9295f2fa9a7acd904382e83 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2951,11 +2951,11 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
> }
>
> if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
> - le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
> + ext4_get_resuid(es) != EXT4_DEF_RESUID)
> SEQ_OPTS_PRINT("resuid=%u",
> from_kuid_munged(&init_user_ns, sbi->s_resuid));
> if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
> - le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
> + ext4_get_resgid(es) != EXT4_DEF_RESGID)
> SEQ_OPTS_PRINT("resgid=%u",
> from_kgid_munged(&init_user_ns, sbi->s_resgid));
> def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
> @@ -5270,8 +5270,8 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>
> ext4_set_def_opts(sb, es);
>
> - sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
> - sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
> + sbi->s_resuid = make_kuid(&init_user_ns, ext4_get_resuid(es));
> + sbi->s_resgid = make_kgid(&init_user_ns, ext4_get_resuid(es));
> sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
> sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
> sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
>
> --
> 2.51.0
>
>
>
^ permalink raw reply
* Re: [PATCH 3/3] ext4: implemet new ioctls to set and get superblock parameters
From: Darrick J. Wong @ 2025-09-11 22:40 UTC (permalink / raw)
To: tytso; +Cc: linux-ext4, linux-api
In-Reply-To: <20250908-tune2fs-v1-3-e3a6929f3355@mit.edu>
On Mon, Sep 08, 2025 at 11:15:50PM -0400, Theodore Ts'o via B4 Relay wrote:
> From: Theodore Ts'o <tytso@mit.edu>
>
> Implement the EXT4_IOC_GET_TUNE_SB_PARAM and
> EXT4_IOC_SET_TUNE_SB_PARAM ioctls, which allow certains superblock
> parameters to be set while the file system is mounted, without needing
> write access to the block device.
>
> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
> ---
> fs/ext4/ioctl.c | 256 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
> include/uapi/linux/ext4.h | 75 ++++++++++++++++++++++
> 2 files changed, 324 insertions(+), 7 deletions(-)
>
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index 84e3c73952d72e436429489f5fc8b7ae1c01c7a1..569c98c962af63130c0119f60788a26a2807bd86 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -27,14 +27,16 @@
> #include "fsmap.h"
> #include <trace/events/ext4.h>
>
> -typedef void ext4_update_sb_callback(struct ext4_super_block *es,
> - const void *arg);
> +typedef void ext4_update_sb_callback(struct ext4_sb_info *sbi,
> + struct ext4_super_block *es,
> + const void *arg);
>
> /*
> * Superblock modification callback function for changing file system
> * label
> */
> -static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
> +static void ext4_sb_setlabel(struct ext4_sb_info *sbi,
> + struct ext4_super_block *es, const void *arg)
> {
> /* Sanity check, this should never happen */
> BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
> @@ -46,7 +48,8 @@ static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
> * Superblock modification callback function for changing file system
> * UUID.
> */
> -static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
> +static void ext4_sb_setuuid(struct ext4_sb_info *sbi,
> + struct ext4_super_block *es, const void *arg)
> {
> memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
> }
> @@ -71,7 +74,7 @@ int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
> goto out_err;
>
> lock_buffer(bh);
> - func(es, arg);
> + func(sbi, es, arg);
> ext4_superblock_csum_set(sb);
> unlock_buffer(bh);
>
> @@ -149,7 +152,7 @@ static int ext4_update_backup_sb(struct super_block *sb,
> unlock_buffer(bh);
> goto out_bh;
> }
> - func(es, arg);
> + func(EXT4_SB(sb), es, arg);
> if (ext4_has_feature_metadata_csum(sb))
> es->s_checksum = ext4_superblock_csum(es);
> set_buffer_uptodate(bh);
> @@ -1230,6 +1233,239 @@ static int ext4_ioctl_setuuid(struct file *filp,
> return ret;
> }
>
> +
> +#define TUNE_OPS_SUPPORTED (EXT4_TUNE_FL_ERRORS_BEHAVIOR | \
> + EXT4_TUNE_FL_MNT_COUNT | EXT4_TUNE_FL_MAX_MNT_COUNT | \
> + EXT4_TUNE_FL_CHECKINTRVAL | EXT4_TUNE_FL_LAST_CHECK_TIME | \
> + EXT4_TUNE_FL_RESERVED_BLOCKS | EXT4_TUNE_FL_RESERVED_UID | \
> + EXT4_TUNE_FL_RESERVED_GID | EXT4_TUNE_FL_DEFAULT_MNT_OPTS | \
> + EXT4_TUNE_FL_DEF_HASH_ALG | EXT4_TUNE_FL_RAID_STRIDE | \
> + EXT4_TUNE_FL_RAID_STRIPE_WIDTH | EXT4_TUNE_FL_MOUNT_OPTS | \
> + EXT4_TUNE_FL_FEATURES | EXT4_TUNE_FL_EDIT_FEATURES | \
> + EXT4_TUNE_FL_FORCE_FSCK)
> +
> +static int ext4_ioctl_get_tune_sb(struct ext4_sb_info *sbi,
> + struct ext4_tune_sb_params __user *params)
> +{
> + struct ext4_tune_sb_params ret;
> + struct ext4_super_block *es = sbi->s_es;
> +
> + memset(&ret, 0, sizeof(ret));
> + ret.set_flags = TUNE_OPS_SUPPORTED;
> + ret.errors_behavior = es->s_errors;
> + ret.mnt_count = le16_to_cpu(es->s_mnt_count);
> + ret.max_mnt_count = le16_to_cpu(es->s_max_mnt_count);
> + ret.checkinterval = le32_to_cpu(es->s_checkinterval);
> + ret.last_check_time = le32_to_cpu(es->s_lastcheck);
> + ret.reserved_blocks = ext4_r_blocks_count(es);
> + ret.blocks_count = ext4_blocks_count(es);
> + ret.reserved_uid = ext4_get_resuid(es);
> + ret.reserved_gid = ext4_get_resgid(es);
> + ret.default_mnt_opts = le32_to_cpu(es->s_default_mount_opts);
> + ret.def_hash_alg = es->s_def_hash_version;
> + ret.raid_stride = le16_to_cpu(es->s_raid_stride);
> + ret.raid_stripe_width = le16_to_cpu(es->s_raid_stripe_width);
> + strscpy_pad(ret.mount_opts, es->s_mount_opts);
> + ret.feature_compat = le32_to_cpu(es->s_feature_compat);
> + ret.feature_incompat = le32_to_cpu(es->s_feature_incompat);
> + ret.feature_ro_compat = le32_to_cpu(es->s_feature_ro_compat);
> + ret.set_feature_compat_mask = EXT4_TUNE_SET_COMPAT_SUPP;
> + ret.set_feature_incompat_mask = EXT4_TUNE_SET_INCOMPAT_SUPP;
> + ret.set_feature_ro_compat_mask = EXT4_TUNE_SET_RO_COMPAT_SUPP;
> + ret.clear_feature_compat_mask = EXT4_TUNE_CLEAR_COMPAT_SUPP;
> + ret.clear_feature_incompat_mask = EXT4_TUNE_CLEAR_INCOMPAT_SUPP;
> + ret.clear_feature_ro_compat_mask = EXT4_TUNE_CLEAR_RO_COMPAT_SUPP;
> + if (copy_to_user(params, &ret, sizeof(ret)))
> + return -EFAULT;
> + return 0;
> +}
> +
> +static void ext4_sb_setparams(struct ext4_sb_info *sbi,
> + struct ext4_super_block *es, const void *arg)
> +{
> + const struct ext4_tune_sb_params *params = arg;
> +
> + if (params->set_flags & EXT4_TUNE_FL_ERRORS_BEHAVIOR)
> + es->s_errors = cpu_to_le16(params->errors_behavior);
> + if (params->set_flags & EXT4_TUNE_FL_MNT_COUNT)
> + es->s_mnt_count = cpu_to_le16(params->mnt_count);
> + if (params->set_flags & EXT4_TUNE_FL_MAX_MNT_COUNT)
> + es->s_max_mnt_count = cpu_to_le16(params->max_mnt_count);
> + if (params->set_flags & EXT4_TUNE_FL_CHECKINTRVAL)
> + es->s_checkinterval = cpu_to_le32(params->checkinterval);
> + if (params->set_flags & EXT4_TUNE_FL_LAST_CHECK_TIME)
> + es->s_lastcheck = cpu_to_le32(params->last_check_time);
> + if (params->set_flags & EXT4_TUNE_FL_RESERVED_BLOCKS) {
> + ext4_fsblk_t blk = params->reserved_blocks;
> +
> + es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
> + es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
> + }
> + if (params->set_flags & EXT4_TUNE_FL_RESERVED_UID) {
> + int uid = params->reserved_uid;
> +
> + es->s_def_resuid = cpu_to_le16(uid & 0xFFFF);
> + es->s_def_resuid_hi = cpu_to_le16(uid >> 16);
> + }
> + if (params->set_flags & EXT4_TUNE_FL_RESERVED_GID) {
> + int gid = params->reserved_gid;
> +
> + es->s_def_resgid = cpu_to_le16(gid & 0xFFFF);
> + es->s_def_resgid_hi = cpu_to_le16(gid >> 16);
> + }
> + if (params->set_flags & EXT4_TUNE_FL_DEFAULT_MNT_OPTS)
> + es->s_default_mount_opts = cpu_to_le32(params->default_mnt_opts);
> + if (params->set_flags & EXT4_TUNE_FL_DEF_HASH_ALG)
> + es->s_def_hash_version = params->def_hash_alg;
> + if (params->set_flags & EXT4_TUNE_FL_RAID_STRIDE)
> + es->s_raid_stride = cpu_to_le16(params->raid_stride);
> + if (params->set_flags & EXT4_TUNE_FL_RAID_STRIPE_WIDTH)
> + es->s_raid_stripe_width =
> + cpu_to_le16(params->raid_stripe_width);
> + strscpy_pad(es->s_mount_opts, params->mount_opts);
> + if (params->set_flags & EXT4_TUNE_FL_EDIT_FEATURES) {
> + es->s_feature_compat |=
> + cpu_to_le32(params->set_feature_compat_mask);
> + es->s_feature_incompat |=
> + cpu_to_le32(params->set_feature_incompat_mask);
> + es->s_feature_ro_compat |=
> + cpu_to_le32(params->set_feature_ro_compat_mask);
> + es->s_feature_compat &=
> + ~cpu_to_le32(params->clear_feature_compat_mask);
> + es->s_feature_incompat &=
> + ~cpu_to_le32(params->clear_feature_incompat_mask);
> + es->s_feature_ro_compat &=
> + ~cpu_to_le32(params->clear_feature_ro_compat_mask);
> + if (params->set_feature_compat_mask &
> + EXT4_FEATURE_COMPAT_DIR_INDEX)
> + es->s_def_hash_version = sbi->s_def_hash_version;
> + if (params->set_feature_incompat_mask &
> + EXT4_FEATURE_INCOMPAT_CSUM_SEED)
> + es->s_checksum_seed = cpu_to_le32(sbi->s_csum_seed);
> + }
> + if (params->set_flags & EXT4_TUNE_FL_FORCE_FSCK)
> + es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
> +}
> +
> +static int ext4_ioctl_set_tune_sb(struct file *filp,
> + struct ext4_tune_sb_params __user *in)
> +{
> + struct ext4_tune_sb_params params;
> + struct super_block *sb = file_inode(filp)->i_sb;
> + struct ext4_sb_info *sbi = EXT4_SB(sb);
> + struct ext4_super_block *es = sbi->s_es;
> + int ret;
> +
> + if (!capable(CAP_SYS_ADMIN))
> + return -EPERM;
> +
> + if (copy_from_user(¶ms, in, sizeof(params)))
> + return -EFAULT;
> +
> + if ((params.set_flags & ~TUNE_OPS_SUPPORTED) != 0)
> + return -EOPNOTSUPP;
> +
> + if ((params.set_flags & EXT4_TUNE_FL_ERRORS_BEHAVIOR) &&
> + (params.errors_behavior > EXT4_ERRORS_PANIC))
> + return -EINVAL;
> +
> + if ((params.set_flags & EXT4_TUNE_FL_RESERVED_BLOCKS) &&
> + (params.reserved_blocks > ext4_blocks_count(sbi->s_es) / 2))
> + return -EINVAL;
> + if ((params.set_flags & EXT4_TUNE_FL_DEF_HASH_ALG) &&
> + ((params.def_hash_alg > DX_HASH_LAST) ||
> + (params.def_hash_alg == DX_HASH_SIPHASH)))
> + return -EINVAL;
> + if ((params.set_flags & EXT4_TUNE_FL_FEATURES) &&
> + (params.set_flags & EXT4_TUNE_FL_EDIT_FEATURES))
> + return -EINVAL;
What's the difference between _FL_FEATURES and _FL_EDIT_FEATURES?
> +
> + if (params.set_flags & EXT4_TUNE_FL_FEATURES) {
> + params.set_feature_compat_mask =
> + params.feature_compat &
> + ~le32_to_cpu(es->s_feature_compat);
> + params.set_feature_incompat_mask =
> + params.feature_incompat &
> + ~le32_to_cpu(es->s_feature_incompat);
> + params.set_feature_ro_compat_mask =
> + params.feature_ro_compat &
> + ~le32_to_cpu(es->s_feature_ro_compat);
> + params.clear_feature_compat_mask =
> + ~params.feature_compat &
> + le32_to_cpu(es->s_feature_compat);
> + params.clear_feature_incompat_mask =
> + ~params.feature_incompat &
> + le32_to_cpu(es->s_feature_incompat);
> + params.clear_feature_ro_compat_mask =
> + ~params.feature_ro_compat &
> + le32_to_cpu(es->s_feature_ro_compat);
> + params.set_flags |= EXT4_TUNE_FL_EDIT_FEATURES;
> + }
> + if (params.set_flags & EXT4_TUNE_FL_EDIT_FEATURES) {
> + if ((params.set_feature_compat_mask &
> + ~EXT4_TUNE_SET_COMPAT_SUPP) ||
> + (params.set_feature_incompat_mask &
> + ~EXT4_TUNE_SET_INCOMPAT_SUPP) ||
> + (params.set_feature_ro_compat_mask &
> + ~EXT4_TUNE_SET_RO_COMPAT_SUPP) ||
> + (params.clear_feature_compat_mask &
> + ~EXT4_TUNE_CLEAR_COMPAT_SUPP) ||
> + (params.clear_feature_incompat_mask &
> + ~EXT4_TUNE_CLEAR_INCOMPAT_SUPP) ||
> + (params.clear_feature_ro_compat_mask &
> + ~EXT4_TUNE_CLEAR_RO_COMPAT_SUPP))
> + return -EOPNOTSUPP;
> +
> + /*
> + * Filter out the features that are already set from
> + * the set_mask.
> + */
> + params.set_feature_compat_mask &=
> + ~le32_to_cpu(es->s_feature_compat);
> + params.set_feature_incompat_mask &=
> + ~le32_to_cpu(es->s_feature_incompat);
> + params.set_feature_ro_compat_mask &=
> + ~le32_to_cpu(es->s_feature_ro_compat);
> + if ((params.set_feature_compat_mask &
> + EXT4_FEATURE_COMPAT_DIR_INDEX) &&
> + !ext4_has_feature_dir_index(sb)) {
> + uuid_t uu;
> +
> + memcpy(&uu, sbi->s_hash_seed, UUID_SIZE);
> + if (uuid_is_null(&uu))
> + generate_random_uuid((char *)
> + &sbi->s_hash_seed);
> + if (params.set_flags & EXT4_TUNE_FL_DEF_HASH_ALG)
> + sbi->s_def_hash_version = params.def_hash_alg;
> + else if (sbi->s_def_hash_version == 0)
> + sbi->s_def_hash_version = DX_HASH_HALF_MD4;
> + if (!(es->s_flags &
> + cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH)) &&
> + !(es->s_flags &
> + cpu_to_le32(EXT2_FLAGS_SIGNED_HASH))) {
> +#ifdef __CHAR_UNSIGNED__
> + sbi->s_hash_unsigned = 3;
> +#else
> + sbi->s_hash_unsigned = 0;
> +#endif
> + }
> + }
> + }
> +
> +
> + ret = mnt_want_write_file(filp);
> + if (ret)
> + return ret;
> +
> + ret = ext4_update_superblocks_fn(sb, ext4_sb_setparams, ¶ms);
> + mnt_drop_write_file(filp);
> +
> + if (params.set_flags & EXT4_TUNE_FL_DEF_HASH_ALG)
> + sbi->s_def_hash_version = params.def_hash_alg;
> +
> + return ret;
> +}
> +
> static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> {
> struct inode *inode = file_inode(filp);
> @@ -1616,6 +1852,11 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
> case EXT4_IOC_SETFSUUID:
> return ext4_ioctl_setuuid(filp, (const void __user *)arg);
> + case EXT4_IOC_GET_TUNE_SB_PARAM:
> + return ext4_ioctl_get_tune_sb(EXT4_SB(sb),
> + (void __user *)arg);
> + case EXT4_IOC_SET_TUNE_SB_PARAM:
> + return ext4_ioctl_set_tune_sb(filp, (void __user *)arg);
> default:
> return -ENOTTY;
> }
> @@ -1703,7 +1944,8 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> }
> #endif
>
> -static void set_overhead(struct ext4_super_block *es, const void *arg)
> +static void set_overhead(struct ext4_sb_info *sbi,
> + struct ext4_super_block *es, const void *arg)
> {
> es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
> }
> diff --git a/include/uapi/linux/ext4.h b/include/uapi/linux/ext4.h
> index 1c4c2dd29112cda9f7dc91d917492cffc33ee524..145875fd633772e76ce7fd8bc0fef136ff620d2d 100644
> --- a/include/uapi/linux/ext4.h
> +++ b/include/uapi/linux/ext4.h
> @@ -33,6 +33,8 @@
> #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
> #define EXT4_IOC_GETFSUUID _IOR('f', 44, struct fsuuid)
> #define EXT4_IOC_SETFSUUID _IOW('f', 44, struct fsuuid)
> +#define EXT4_IOC_GET_TUNE_SB_PARAM _IOR('f', 45, struct ext4_tune_sb_params)
> +#define EXT4_IOC_SET_TUNE_SB_PARAM _IOW('f', 46, struct ext4_tune_sb_params)
>
> #define EXT4_IOC_SHUTDOWN _IOR('X', 125, __u32)
>
> @@ -108,6 +110,79 @@ struct ext4_new_group_input {
> __u16 unused;
> };
>
> +struct ext4_tune_sb_params {
> + __u32 set_flags;
> + __u32 checkinterval;
> + __u16 errors_behavior;
> + __u16 mnt_count;
> + __u16 max_mnt_count;
> + __u16 raid_stride;
> + __u64 last_check_time;
> + __u64 reserved_blocks;
> + __u64 blocks_count;
> + __u32 default_mnt_opts;
> + __u32 reserved_uid;
> + __u32 reserved_gid;
> + __u32 raid_stripe_width;
> + __u8 def_hash_alg;
> + __u8 pad_1;
> + __u16 pad_2;
> + __u32 feature_compat;
> + __u32 feature_incompat;
> + __u32 feature_ro_compat;
> + __u32 set_feature_compat_mask;
> + __u32 set_feature_incompat_mask;
> + __u32 set_feature_ro_compat_mask;
> + __u32 clear_feature_compat_mask;
> + __u32 clear_feature_incompat_mask;
> + __u32 clear_feature_ro_compat_mask;
> + __u8 mount_opts[64];
> + __u8 pad[64];
> +};
> +
> +#define EXT4_TUNE_FL_ERRORS_BEHAVIOR 0x00000001
> +#define EXT4_TUNE_FL_MNT_COUNT 0x00000002
> +#define EXT4_TUNE_FL_MAX_MNT_COUNT 0x00000004
> +#define EXT4_TUNE_FL_CHECKINTRVAL 0x00000008
> +#define EXT4_TUNE_FL_LAST_CHECK_TIME 0x00000010
> +#define EXT4_TUNE_FL_RESERVED_BLOCKS 0x00000020
> +#define EXT4_TUNE_FL_RESERVED_UID 0x00000040
> +#define EXT4_TUNE_FL_RESERVED_GID 0x00000080
> +#define EXT4_TUNE_FL_DEFAULT_MNT_OPTS 0x00000100
> +#define EXT4_TUNE_FL_DEF_HASH_ALG 0x00000200
> +#define EXT4_TUNE_FL_RAID_STRIDE 0x00000400
> +#define EXT4_TUNE_FL_RAID_STRIPE_WIDTH 0x00000800
> +#define EXT4_TUNE_FL_MOUNT_OPTS 0x00001000
> +#define EXT4_TUNE_FL_FEATURES 0x00002000
> +#define EXT4_TUNE_FL_EDIT_FEATURES 0x00004000
> +#define EXT4_TUNE_FL_FORCE_FSCK 0x00008000
> +
> +#define EXT4_TUNE_SET_COMPAT_SUPP \
> + (EXT4_FEATURE_COMPAT_DIR_INDEX | \
> + EXT4_FEATURE_COMPAT_STABLE_INODES)
> +#define EXT4_TUNE_SET_INCOMPAT_SUPP \
> + (EXT4_FEATURE_INCOMPAT_EXTENTS | \
> + EXT4_FEATURE_INCOMPAT_EA_INODE | \
> + EXT4_FEATURE_INCOMPAT_ENCRYPT | \
> + EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
> + EXT4_FEATURE_INCOMPAT_LARGEDIR | \
> + EXT4_FEATURE_INCOMPAT_CASEFOLD)
> +#define EXT4_TUNE_SET_RO_COMPAT_SUPP \
> + (EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
> + EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
> + EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
> + EXT4_FEATURE_RO_COMPAT_READONLY | \
> + EXT4_FEATURE_RO_COMPAT_PROJECT | \
> + EXT4_FEATURE_RO_COMPAT_VERITY)
> +
> +#define EXT4_TUNE_CLEAR_COMPAT_SUPP (0)
> +#define EXT4_TUNE_CLEAR_INCOMPAT_SUPP (0)
> +#define EXT4_TUNE_CLEAR_RO_COMPAT_SUPP \
> + (EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
> + EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
> + EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
> + EXT4_FEATURE_RO_COMPAT_PROJECT)
Is it actually safe to clear these without scanning the filesystem to
make sure nobody's using these features?
--D
> +
> /*
> * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
> * It indicates that the entry in extent status cache is for a hole.
>
> --
> 2.51.0
>
>
>
^ permalink raw reply
* Re: [PATCH 1/3] ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()
From: Theodore Ts'o @ 2025-09-12 2:12 UTC (permalink / raw)
To: Darrick J. Wong; +Cc: linux-ext4, linux-api, stable, Kees Cook, jannh
In-Reply-To: <20250911222700.GC8084@frogsfrogsfrogs>
On Thu, Sep 11, 2025 at 03:27:00PM -0700, Darrick J. Wong wrote:
> On Mon, Sep 08, 2025 at 11:15:48PM -0400, Theodore Ts'o via B4 Relay wrote:
> > From: Theodore Ts'o <tytso@mit.edu>
> >
> > Unlike other strings in the ext4 superblock, we rely on tune2fs to
> > make sure s_mount_opts is NUL terminated. Harden
> > parse_apply_sb_mount_options() by treating s_mount_opts as a potential
> > __nonstring.
>
> Uh.... does that mean that a filesystem with exactly 64 bytes worth of
> mount option string (and no trailing null) could do something malicious?
Maybe.... I'm surprised syzkaller hasn't managed to create a
maliciously fuzzed file system along these lines.
This was one of the things that I found while I was poking about in
code that I hadn't examined in years. And I guess the kernel
hardening folks have been looking for strndup() as a deprecated
interface, but apparently they haven't targetted kstrndup() yet.
> My guess is that s_usr_quota_inum mostly saves us, but a nastycrafted
> filesystem with more than 2^24 inodes could cause an out of bounds
> memory access? But that most likely will just fail the mount option
> parser anyway?
Actually, s_usr_quota_inum won't help, because s_mount_opts is copied
into allocated memory using kstrndup(). So the buffer overrun is
going to be in the allocated memory buffer, and since parse_options()
uses strsep() it could potentially modify an adajacent string/buffer
by replacing ',' and '=' bytes with NUL characters. I'll leave to
security engineers to see if they can turn it into a usuable exploit,
although I've always said that mounting untrusted file systems isn't a
wise thing for a paranoid system administrator to do/allow, which is
why I'm a big fan of your fuse2fs work. :-)
- Ted
^ permalink raw reply
* Re: [PATCH 2/3] ext4: add support for 32-bit default reserved uid and gid values
From: Theodore Ts'o @ 2025-09-12 2:57 UTC (permalink / raw)
To: Darrick J. Wong, G; +Cc: linux-ext4, linux-api
In-Reply-To: <20250911223121.GD8084@frogsfrogsfrogs>
On Thu, Sep 11, 2025 at 03:31:21PM -0700, Darrick J. Wong wrote:
>
> Is there a risk that some garbage written to s_reserved (and not caught
> by either the kernel or e2fsck) will now appear as a "legitimate" resuid
> value?
The superblock is checksumed, so the risk would be that some
impleentation modifies the superblock and updates s_reserved for some
reason. But they could do that to any superblock field, or to the low
16 bits of s_resuid/s_resgid today, and that's something that neither
the kernel or e2fsck could check.
The mke2fs program zeroes all of the unused/reserved portions of the
superblock, so the risk is some random non-Linux implementation (e.g.,
GNU Hurd or BSD) had hijacked some reserved field without coordinating
with upstream ext4. I thought about using some kind of compat feature
flag, but it probably wouldn't help since the other implementation
would likely not bother to use their own feature flag since that would
prevent the file system to be mounted with Linux.
Currently, someone tried to run "tune2fs -u 146878 /tmp/foo.img" we'll
silently drop the high 16 bits:
% tune2fs -u 146878 /tmp/foo.img
tune2fs 1.47.3-rc2 (12-Jun-2025)
Setting reserved blocks uid to 146878
% dumpe2fs -h /tmp/foo.img | grep uid
dumpe2fs 1.47.3-rc2 (12-Jun-2025)
Reserved blocks uid: 15806 (user tytso)
And if we have implementations that support 32-bit reserved
uid's/gid's, and the file system is mounted on an older kernel, it
will simply use a different reserved uid (e.g., 15806 instead of
146878). But we're kind of confused today, and in practice most of
the time people will be using low reserved uid's/gid's (e.g., 1 for
daemon, etc.).
- Ted
^ permalink raw reply
* Re: [PATCH 3/3] ext4: implemet new ioctls to set and get superblock parameters
From: Theodore Ts'o @ 2025-09-12 3:14 UTC (permalink / raw)
To: Darrick J. Wong; +Cc: linux-ext4, linux-api
In-Reply-To: <20250911224019.GE8084@frogsfrogsfrogs>
On Thu, Sep 11, 2025 at 03:40:19PM -0700, Darrick J. Wong wrote:
>
> What's the difference between _FL_FEATURES and _FL_EDIT_FEATURES?
We have three sets of
_FL_FEATURES allows the user to set the features via:
__u32 feature_compat;
__u32 feature_incompat;
__u32 feature_ro_compat;
... while _FS_EDIT_FEATURES allows the user to set or clear specific
feature or feature(s) using these fields:
__u32 set_feature_compat_mask;
__u32 set_feature_incompat_mask;
__u32 set_feature_ro_compat_mask;
__u32 clear_feature_compat_mask;
__u32 clear_feature_incompat_mask;
__u32 clear_feature_ro_compat_mask;
I originally only implemented _FS_EDIT_EFATURES but it turns out that
given how tune2fs() and e2p_edit_feateurs2() was implemented,
_FS_FEATURES was a lot more convenient. But I kept _FS_EDIT_FEATURES
in case some other users wanted an easy way to, say, "just enable
feature X" using a single ioctl.
> > +#define EXT4_TUNE_CLEAR_COMPAT_SUPP (0)
> > +#define EXT4_TUNE_CLEAR_INCOMPAT_SUPP (0)
> > +#define EXT4_TUNE_CLEAR_RO_COMPAT_SUPP \
> > + (EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
> > + EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
> > + EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
> > + EXT4_FEATURE_RO_COMPAT_PROJECT)
>
> Is it actually safe to clear these without scanning the filesystem to
> make sure nobody's using these features?
Hmm.... probably not. For some of these features, tune2fs will issue
a "pleas run e2fsck -f" before mounting the file system. All of these
featrues tune2fs will allow being cleared on a mounted file system,
but looking at this more closely, I probably *shouldn't* have allowed
tune2fs to remove the feature wile the file system is mounted. (For
example, tune2fs -O ^project" will try to clear they project quota
inode even if the file system is mounted, hilarity would soon
follow...)
- Ted
^ permalink raw reply
* [PATCH] sched/deadline: Add reporting of runtime left & abs deadline to sched_getattr() for DEADLINE tasks
From: Tommaso Cucinotta @ 2025-09-12 5:38 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Ingo Molnar, Juri Lelli, Vincent Guittot, Dietmar Eggemann,
Steven Rostedt, Ben Segall, Mel Gorman, Valentin Schneider,
linux-kernel, linux-api, Tommaso Cucinotta, Tommaso Cucinotta
I'm resending this patch proposal after having addressed a few Juri's
comments, and a rebase on top of the post-august-break tip sched/core.
The SCHED_DEADLINE scheduler allows reading the statically configured
run-time, deadline, and period parameters through the sched_getattr()
system call. However, there is no immediate way to access, from user space,
the current parameters used within the scheduler: the instantaneous runtime
left in the current cycle, as well as the current absolute deadline.
The `flags' sched_getattr() parameter, so far mandated to contain zero,
now supports the SCHED_GETATTR_FLAG_DL_DYNAMIC=1 flag, to request
retrieval of the leftover runtime and absolute deadline, converted to a
CLOCK_MONOTONIC reference, instead of the statically configured parameters.
This feature is useful for adaptive SCHED_DEADLINE tasks that need to
modify their behavior depending on whether or not there is enough runtime
left in the current period, and/or what is the current absolute deadline.
Notes:
- before returning the instantaneous parameters, the runtime is updated;
- the abs deadline is returned shifted from rq_clock() to ktime_get_ns(),
in CLOCK_MONOTONIC reference; this causes multiple invocations from the
same period to return values that may differ for a few ns (showing some
small drift), albeit the deadline doesn't move, in rq_clock() reference;
- the abs deadline value returned to user-space, as unsigned 64-bit value,
can represent nearly 585 years since boot time;
- setting flags=0 provides the old behavior (retrieve static parameters).
See also the notes from discussion held at OSPM 2025 on the topic
"Making user space aware of current deadline-scheduler parameters".
Signed-off-by: Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it>
^ permalink raw reply
* [PATCH] sched/deadline: Add reporting of runtime left & abs deadline to sched_getattr() for DEADLINE tasks
From: Tommaso Cucinotta @ 2025-09-12 5:38 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Ingo Molnar, Juri Lelli, Vincent Guittot, Dietmar Eggemann,
Steven Rostedt, Ben Segall, Mel Gorman, Valentin Schneider,
linux-kernel, linux-api, Tommaso Cucinotta, Tommaso Cucinotta
In-Reply-To: <20250912053937.31636-1-tommaso.cucinotta@santannapisa.it>
The SCHED_DEADLINE scheduler allows reading the statically configured
run-time, deadline, and period parameters through the sched_getattr()
system call. However, there is no immediate way to access, from user space,
the current parameters used within the scheduler: the instantaneous runtime
left in the current cycle, as well as the current absolute deadline.
The `flags' sched_getattr() parameter, so far mandated to contain zero,
now supports the SCHED_GETATTR_FLAG_DL_DYNAMIC=1 flag, to request
retrieval of the leftover runtime and absolute deadline, converted to a
CLOCK_MONOTONIC reference, instead of the statically configured parameters.
This feature is useful for adaptive SCHED_DEADLINE tasks that need to
modify their behavior depending on whether or not there is enough runtime
left in the current period, and/or what is the current absolute deadline.
Notes:
- before returning the instantaneous parameters, the runtime is updated;
- the abs deadline is returned shifted from rq_clock() to ktime_get_ns(),
in CLOCK_MONOTONIC reference; this causes multiple invocations from the
same period to return values that may differ for a few ns (showing some
small drift), albeit the deadline doesn't move, in rq_clock() reference;
- the abs deadline value returned to user-space, as unsigned 64-bit value,
can represent nearly 585 years since boot time;
- setting flags=0 provides the old behavior (retrieve static parameters).
See also the notes from discussion held at OSPM 2025 on the topic
"Making user space aware of current deadline-scheduler parameters".
Signed-off-by: Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it>
---
include/uapi/linux/sched.h | 3 +++
kernel/sched/deadline.c | 19 ++++++++++++++++---
kernel/sched/sched.h | 2 +-
kernel/sched/syscalls.c | 16 +++++++++++-----
4 files changed, 31 insertions(+), 9 deletions(-)
diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
index 359a14cc..52b69ce8 100644
--- a/include/uapi/linux/sched.h
+++ b/include/uapi/linux/sched.h
@@ -146,4 +146,7 @@ struct clone_args {
SCHED_FLAG_KEEP_ALL | \
SCHED_FLAG_UTIL_CLAMP)
+/* Only for sched_getattr() own flag param, if task is SCHED_DEADLINE */
+#define SCHED_GETATTR_FLAG_DL_DYNAMIC 0x01
+
#endif /* _UAPI_LINUX_SCHED_H */
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 5b64bc62..b1c7c988 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -3328,13 +3328,26 @@ void __setparam_dl(struct task_struct *p, const struct sched_attr *attr)
dl_se->dl_density = to_ratio(dl_se->dl_deadline, dl_se->dl_runtime);
}
-void __getparam_dl(struct task_struct *p, struct sched_attr *attr)
+void __getparam_dl(struct task_struct *p, struct sched_attr *attr, unsigned int flags)
{
struct sched_dl_entity *dl_se = &p->dl;
+ struct rq *rq = task_rq(p);
+ u64 adj_deadline;
attr->sched_priority = p->rt_priority;
- attr->sched_runtime = dl_se->dl_runtime;
- attr->sched_deadline = dl_se->dl_deadline;
+ if (flags & SCHED_GETATTR_FLAG_DL_DYNAMIC) {
+ guard(raw_spinlock_irq)(&rq->__lock);
+ update_rq_clock(rq);
+ if (task_current(rq, p))
+ update_curr_dl(rq);
+
+ attr->sched_runtime = dl_se->runtime;
+ adj_deadline = dl_se->deadline - rq_clock(rq) + ktime_get_ns();
+ attr->sched_deadline = adj_deadline;
+ } else {
+ attr->sched_runtime = dl_se->dl_runtime;
+ attr->sched_deadline = dl_se->dl_deadline;
+ }
attr->sched_period = dl_se->dl_period;
attr->sched_flags &= ~SCHED_DL_FLAGS;
attr->sched_flags |= dl_se->flags;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index b5367c51..42ddfccb 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -353,7 +353,7 @@ extern int sched_dl_global_validate(void);
extern void sched_dl_do_global(void);
extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr);
extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr);
-extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr);
+extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr, unsigned int flags);
extern bool __checkparam_dl(const struct sched_attr *attr);
extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr);
extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c
index 77ae87f3..d7eac588 100644
--- a/kernel/sched/syscalls.c
+++ b/kernel/sched/syscalls.c
@@ -928,10 +928,10 @@ static int sched_copy_attr(struct sched_attr __user *uattr, struct sched_attr *a
return -E2BIG;
}
-static void get_params(struct task_struct *p, struct sched_attr *attr)
+static void get_params(struct task_struct *p, struct sched_attr *attr, unsigned int flags)
{
if (task_has_dl_policy(p)) {
- __getparam_dl(p, attr);
+ __getparam_dl(p, attr, flags);
} else if (task_has_rt_policy(p)) {
attr->sched_priority = p->rt_priority;
} else {
@@ -997,7 +997,7 @@ SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr,
return -ESRCH;
if (attr.sched_flags & SCHED_FLAG_KEEP_PARAMS)
- get_params(p, &attr);
+ get_params(p, &attr, 0);
return sched_setattr(p, &attr);
}
@@ -1082,7 +1082,7 @@ SYSCALL_DEFINE4(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,
int retval;
if (unlikely(!uattr || pid < 0 || usize > PAGE_SIZE ||
- usize < SCHED_ATTR_SIZE_VER0 || flags))
+ usize < SCHED_ATTR_SIZE_VER0))
return -EINVAL;
scoped_guard (rcu) {
@@ -1090,6 +1090,12 @@ SYSCALL_DEFINE4(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,
if (!p)
return -ESRCH;
+ if (flags) {
+ if (!task_has_dl_policy(p) ||
+ flags != SCHED_GETATTR_FLAG_DL_DYNAMIC)
+ return -EINVAL;
+ }
+
retval = security_task_getscheduler(p);
if (retval)
return retval;
@@ -1097,7 +1103,7 @@ SYSCALL_DEFINE4(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,
kattr.sched_policy = p->policy;
if (p->sched_reset_on_fork)
kattr.sched_flags |= SCHED_FLAG_RESET_ON_FORK;
- get_params(p, &kattr);
+ get_params(p, &kattr, flags);
kattr.sched_flags &= SCHED_FLAG_ALL;
#ifdef CONFIG_UCLAMP_TASK
--
2.45.2
^ permalink raw reply related
* [PATCH 00/62] initrd: remove classic initrd support
From: Askar Safin @ 2025-09-12 22:38 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
Intro
====
This patchset removes classic initrd (initial RAM disk) support,
which was deprecated in 2020.
Initramfs still stays, and RAM disk itself (brd) still stays, too.
init/do_mounts* and init/*initramfs* are listed in VFS entry in
MAINTAINERS, so I think this patchset should go through VFS tree.
This patchset touchs every subdirectory in arch/, so I tested it
on 8 (!!!) archs in Qemu (see details below).
Warning: this patchset renames CONFIG_BLK_DEV_INITRD (!!!) to CONFIG_INITRAMFS
and CONFIG_RD_* to CONFIG_INITRAMFS_DECOMPRESS_* (for example,
CONFIG_RD_GZIP to CONFIG_INITRAMFS_DECOMPRESS_GZIP).
If you still use initrd, see below for workaround.
Details
====
I not only removed initrd, I also removed a lot of code, which
became dead, including a lot of code in arch/.
Still I think the only two architectures I touched in non-trivial
way are sh and 32-bit arm.
Also I renamed some files, functions and variables (which became misnomers) to proper names,
moved some code around, removed a lot of mentions of initrd
in code and comments. Also I cleaned up some docs.
For example, I renamed the following global variables:
__initramfs_start
__initramfs_size
phys_initrd_start
phys_initrd_size
initrd_start
initrd_end
to:
__builtin_initramfs_start
__builtin_initramfs_size
phys_external_initramfs_start
phys_external_initramfs_size
virt_external_initramfs_start
virt_external_initramfs_end
New names precisely capture meaning of these variables.
Also I renamed CONFIG_BLK_DEV_INITRD (which became total misnomer)
to CONFIG_INITRAMFS. And CONFIG_RD_* to CONFIG_INITRAMFS_DECOMPRESS_*.
This will break all configs out there (update your configs!).
Still I think this is okay,
because config names never were part of stable API.
Still, I don't have strong opinion here, so I can drop these renamings
if needed.
Other user-visible changes:
- Removed kernel command line parameters "load_ramdisk" and
"prompt_ramdisk", which did nothing and were deprecated
- Removed kernel command line parameter "ramdisk_start",
which was used for initrd only (not for initramfs)
- Removed kernel command line parameter "noinitrd",
which was inconsistent: it controlled initrd only
(not initramfs), except for EFI boot, where it
controlled both initramfs and initrd. EFI users
still can disable initramfs simply by not passing it
- Removed kernel command line parameter "ramdisk_size",
which used for controlling ramdisk (brd), but only
in non-modular mode. Use brd.rd_size instead, it
always works
- Removed /proc/sys/kernel/real-root-dev . It was used
for initrd only
This patchset is based on v6.17-rc5.
Testing
====
I tested my patchset on many architectures in Qemu using my Rust
program, heavily based on mkroot [1].
I used the following cross-compilers:
aarch64-linux-musleabi
armv4l-linux-musleabihf
armv5l-linux-musleabihf
armv7l-linux-musleabihf
i486-linux-musl
i686-linux-musl
mips-linux-musl
mips64-linux-musl
mipsel-linux-musl
powerpc-linux-musl
powerpc64-linux-musl
powerpc64le-linux-musl
riscv32-linux-musl
riscv64-linux-musl
s390x-linux-musl
sh4-linux-musl
sh4eb-linux-musl
x86_64-linux-musl
taken from this directory [2].
So, as you can see, there are 18 triplets, which correspond to 8 subdirs in arch/.
And note that this list contains two archs (arm and sh) touched in non-trivial way.
For every triplet I tested that:
- Initramfs still works (both builtin and external)
- Direct boot from disk still works
Workaround
====
If "retain_initrd" is passed to kernel, then initramfs/initrd,
passed by bootloader, is retained and becomes available after boot
as read-only magic file /sys/firmware/initrd [3].
No copies are involved. I. e. /sys/firmware/initrd is simply
a reference to original blob passed by bootloader.
This works even if initrd/initramfs is not recognized by kernel
in any way, i. e. even if it is not valid cpio archive, nor
a fs image supported by classic initrd.
This works both with my patchset and without it.
This means that you can emulate classic initrd so:
link builtin initramfs to kernel. In /init in this initramfs
copy /sys/firmware/initrd to some file in / and loop-mount it.
This is even better than classic initrd, because:
- You can use fs not supported by classic initrd, for example erofs
- One copy is involved (from /sys/firmware/initrd to some file in /)
as opposed to two when using classic initrd
Still, I don't recommend using this workaround, because
I want everyone to migrate to proper modern initramfs.
But still you can use this workaround if you want.
Also: it is not possible to directly loop-mount
/sys/firmware/initrd . Theoretically kernel can be changed
to allow this (and/or to make it writable), but I think nobody needs this.
And I don't want to implement this.
[1] https://github.com/landley/toybox/tree/master/mkroot
[2] https://landley.net/toybox/downloads/binaries/toolchains/latest
[3] https://lore.kernel.org/all/20231207235654.16622-1-graf@amazon.com/
Askar Safin (62):
init: remove deprecated "load_ramdisk" command line parameter, which
does nothing
init: remove deprecated "prompt_ramdisk" command line parameter, which
does nothing
init: sh, sparc, x86: remove unused constants RAMDISK_PROMPT_FLAG and
RAMDISK_LOAD_FLAG
init: x86, arm, sh, sparc: remove variable rd_image_start, which
controls starting block number of initrd
init: remove "ramdisk_start" command line parameter, which controls
starting block number of initrd
arm: init: remove special logic for setting brd.rd_size
arm: init: remove ATAG_RAMDISK
arm: init: remove FLAG_RDLOAD and FLAG_RDPROMPT
arm: init: document rd_start (in param_struct) as obsolete
initrd: remove initrd (initial RAM disk) support
init, efi: remove "noinitrd" command line parameter
init: remove /proc/sys/kernel/real-root-dev
ext2: remove ext2_image_size and associated code
init: m68k, mips, powerpc, s390, sh: remove Root_RAM0
doc: modernize Documentation/admin-guide/blockdev/ramdisk.rst
brd: remove "ramdisk_size" command line parameter
doc: modernize Documentation/filesystems/ramfs-rootfs-initramfs.rst
doc: modernize
Documentation/driver-api/early-userspace/early_userspace_support.rst
init: remove mentions of "ramdisk=" command line parameter
doc: remove Documentation/power/swsusp-dmcrypt.rst
init: remove all mentions of root=/dev/ram*
doc: remove obsolete mentions of pivot_root
init: rename __initramfs_{start,size} to
__builtin_initramfs_{start,size}
init: remove wrong comment
init: rename phys_initrd_{start,size} to
phys_external_initramfs_{start,size}
init: move phys_external_initramfs_{start,size} to init/initramfs.c
init: alpha: remove "extern unsigned long initrd_start, initrd_end"
init: alpha, arc, arm, arm64, csky, m68k, microblaze, mips, nios2,
openrisc, parisc, powerpc, s390, sh, sparc, um, x86, xtensa: rename
initrd_{start,end} to virt_external_initramfs_{start,end}
init: move virt_external_initramfs_{start,end} to init/initramfs.c
doc: remove documentation for block device 4 0
init: rename initrd_below_start_ok to initramfs_below_start_ok
init: move initramfs_below_start_ok to init/initramfs.c
init: remove init/do_mounts_initrd.c
init: inline create_dev into the only caller
init: make mount_root_generic static
init: make mount_root static
init: remove root_mountflags from init/do_mounts.h
init: remove most headers from init/do_mounts.h
init: make console_on_rootfs static
init: rename free_initrd_mem to free_initramfs_mem
init: rename reserve_initrd_mem to reserve_initramfs_mem
init: rename <linux/initrd.h> to <linux/initramfs.h>
setsid: inline ksys_setsid into the only caller
doc: kernel-parameters: remove [RAM] from reserve_mem=
doc: kernel-parameters: replace [RAM] with [INITRAMFS]
init: edit docs for initramfs-related configs
init: fix typo: virtul => virtual
init: fix comment
init: rename ramdisk_execute_command to initramfs_execute_command
init: rename ramdisk_command_access to initramfs_command_access
init: rename get_boot_config_from_initrd to
get_boot_config_from_initramfs
init: rename do_retain_initrd to retain_initramfs
init: rename kexec_free_initrd to kexec_free_initramfs
init: arm, x86: deal with some references to initrd
init: rename CONFIG_BLK_DEV_INITRD to CONFIG_INITRAMFS
init: rename CONFIG_RD_GZIP to CONFIG_INITRAMFS_DECOMPRESS_GZIP
init: rename CONFIG_RD_BZIP2 to CONFIG_INITRAMFS_DECOMPRESS_BZIP2
init: rename CONFIG_RD_LZMA to CONFIG_INITRAMFS_DECOMPRESS_LZMA
init: rename CONFIG_RD_XZ to CONFIG_INITRAMFS_DECOMPRESS_XZ
init: rename CONFIG_RD_LZO to CONFIG_INITRAMFS_DECOMPRESS_LZO
init: rename CONFIG_RD_LZ4 to CONFIG_INITRAMFS_DECOMPRESS_LZ4
init: rename CONFIG_RD_ZSTD to CONFIG_INITRAMFS_DECOMPRESS_ZSTD
.../admin-guide/blockdev/ramdisk.rst | 104 +----
.../admin-guide/device-mapper/dm-init.rst | 4 +-
Documentation/admin-guide/devices.txt | 12 -
Documentation/admin-guide/index.rst | 1 -
Documentation/admin-guide/initrd.rst | 383 ------------------
.../admin-guide/kernel-parameters.rst | 4 +-
.../admin-guide/kernel-parameters.txt | 38 +-
Documentation/admin-guide/nfs/nfsroot.rst | 4 +-
Documentation/admin-guide/sysctl/kernel.rst | 6 -
Documentation/arch/arm/ixp4xx.rst | 4 +-
Documentation/arch/arm/setup.rst | 6 +-
Documentation/arch/m68k/kernel-options.rst | 29 +-
Documentation/arch/x86/boot.rst | 4 +-
.../early_userspace_support.rst | 18 +-
.../filesystems/ramfs-rootfs-initramfs.rst | 20 +-
Documentation/power/index.rst | 1 -
Documentation/power/swsusp-dmcrypt.rst | 140 -------
Documentation/security/ipe.rst | 2 +-
.../translations/zh_CN/power/index.rst | 1 -
arch/alpha/kernel/core_irongate.c | 12 +-
arch/alpha/kernel/proto.h | 2 +-
arch/alpha/kernel/setup.c | 32 +-
arch/arc/configs/axs101_defconfig | 2 +-
arch/arc/configs/axs103_defconfig | 2 +-
arch/arc/configs/axs103_smp_defconfig | 2 +-
arch/arc/configs/haps_hs_defconfig | 2 +-
arch/arc/configs/haps_hs_smp_defconfig | 2 +-
arch/arc/configs/hsdk_defconfig | 2 +-
arch/arc/configs/nsim_700_defconfig | 2 +-
arch/arc/configs/nsimosci_defconfig | 2 +-
arch/arc/configs/nsimosci_hs_defconfig | 2 +-
arch/arc/configs/nsimosci_hs_smp_defconfig | 2 +-
arch/arc/configs/tb10x_defconfig | 4 +-
arch/arc/configs/vdk_hs38_defconfig | 2 +-
arch/arc/configs/vdk_hs38_smp_defconfig | 2 +-
arch/arc/mm/init.c | 14 +-
arch/arm/Kconfig | 2 +-
arch/arm/boot/dts/arm/integratorap.dts | 2 +-
arch/arm/boot/dts/arm/integratorcp.dts | 2 +-
.../dts/aspeed/aspeed-bmc-facebook-cmm.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-galaxy100.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-minipack.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-wedge100.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-wedge40.dts | 2 +-
.../dts/aspeed/aspeed-bmc-facebook-yamp.dts | 2 +-
.../ast2600-facebook-netbmc-common.dtsi | 2 +-
arch/arm/boot/dts/hisilicon/hi3620-hi4511.dts | 2 +-
.../ixp/intel-ixp42x-welltech-epbx100.dts | 2 +-
arch/arm/boot/dts/nspire/nspire-classic.dtsi | 2 +-
arch/arm/boot/dts/nspire/nspire-cx.dts | 2 +-
.../boot/dts/samsung/exynos4210-origen.dts | 2 +-
.../boot/dts/samsung/exynos4210-smdkv310.dts | 2 +-
.../boot/dts/samsung/exynos4412-smdk4412.dts | 2 +-
.../boot/dts/samsung/exynos5250-smdk5250.dts | 2 +-
arch/arm/boot/dts/st/ste-nomadik-nhk15.dts | 2 +-
arch/arm/boot/dts/st/ste-nomadik-s8815.dts | 2 +-
arch/arm/boot/dts/st/stm32429i-eval.dts | 2 +-
arch/arm/boot/dts/st/stm32746g-eval.dts | 2 +-
arch/arm/boot/dts/st/stm32f429-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32f469-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32f746-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32f769-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32h743i-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32h743i-eval.dts | 2 +-
arch/arm/boot/dts/st/stm32h747i-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32h750i-art-pi.dts | 2 +-
arch/arm/configs/aspeed_g4_defconfig | 8 +-
arch/arm/configs/aspeed_g5_defconfig | 8 +-
arch/arm/configs/assabet_defconfig | 4 +-
arch/arm/configs/at91_dt_defconfig | 4 +-
arch/arm/configs/axm55xx_defconfig | 2 +-
arch/arm/configs/bcm2835_defconfig | 2 +-
arch/arm/configs/clps711x_defconfig | 4 +-
arch/arm/configs/collie_defconfig | 4 +-
arch/arm/configs/davinci_all_defconfig | 2 +-
arch/arm/configs/exynos_defconfig | 4 +-
arch/arm/configs/footbridge_defconfig | 2 +-
arch/arm/configs/gemini_defconfig | 2 +-
arch/arm/configs/h3600_defconfig | 2 +-
arch/arm/configs/hisi_defconfig | 4 +-
arch/arm/configs/imx_v4_v5_defconfig | 2 +-
arch/arm/configs/imx_v6_v7_defconfig | 4 +-
arch/arm/configs/integrator_defconfig | 2 +-
arch/arm/configs/ixp4xx_defconfig | 2 +-
arch/arm/configs/keystone_defconfig | 2 +-
arch/arm/configs/lpc18xx_defconfig | 12 +-
arch/arm/configs/lpc32xx_defconfig | 4 +-
arch/arm/configs/milbeaut_m10v_defconfig | 2 +-
arch/arm/configs/multi_v4t_defconfig | 2 +-
arch/arm/configs/multi_v5_defconfig | 2 +-
arch/arm/configs/multi_v7_defconfig | 2 +-
arch/arm/configs/mvebu_v7_defconfig | 2 +-
arch/arm/configs/mxs_defconfig | 2 +-
arch/arm/configs/neponset_defconfig | 4 +-
arch/arm/configs/nhk8815_defconfig | 2 +-
arch/arm/configs/omap1_defconfig | 2 +-
arch/arm/configs/omap2plus_defconfig | 2 +-
arch/arm/configs/pxa910_defconfig | 2 +-
arch/arm/configs/pxa_defconfig | 4 +-
arch/arm/configs/qcom_defconfig | 2 +-
arch/arm/configs/rpc_defconfig | 2 +-
arch/arm/configs/s3c6400_defconfig | 4 +-
arch/arm/configs/s5pv210_defconfig | 4 +-
arch/arm/configs/sama5_defconfig | 4 +-
arch/arm/configs/sama7_defconfig | 2 +-
arch/arm/configs/shmobile_defconfig | 2 +-
arch/arm/configs/socfpga_defconfig | 2 +-
arch/arm/configs/sp7021_defconfig | 12 +-
arch/arm/configs/spear13xx_defconfig | 2 +-
arch/arm/configs/spear3xx_defconfig | 2 +-
arch/arm/configs/spear6xx_defconfig | 2 +-
arch/arm/configs/spitz_defconfig | 2 +-
arch/arm/configs/stm32_defconfig | 2 +-
arch/arm/configs/sunxi_defconfig | 2 +-
arch/arm/configs/tegra_defconfig | 2 +-
arch/arm/configs/u8500_defconfig | 4 +-
arch/arm/configs/versatile_defconfig | 2 +-
arch/arm/configs/vexpress_defconfig | 2 +-
arch/arm/configs/vf610m4_defconfig | 10 +-
arch/arm/configs/vt8500_v6_v7_defconfig | 2 +-
arch/arm/configs/wpcm450_defconfig | 2 +-
arch/arm/include/uapi/asm/setup.h | 10 -
arch/arm/kernel/atags_compat.c | 10 -
arch/arm/kernel/atags_parse.c | 16 +-
arch/arm/kernel/setup.c | 2 +-
arch/arm/mm/init.c | 24 +-
arch/arm64/configs/defconfig | 2 +-
arch/arm64/kernel/setup.c | 2 +-
arch/arm64/mm/init.c | 17 +-
arch/csky/kernel/setup.c | 24 +-
arch/csky/mm/init.c | 2 +-
arch/hexagon/configs/comet_defconfig | 2 +-
arch/loongarch/configs/loongson3_defconfig | 2 +-
arch/loongarch/kernel/mem.c | 2 +-
arch/loongarch/kernel/setup.c | 4 +-
arch/m68k/configs/amiga_defconfig | 2 +-
arch/m68k/configs/apollo_defconfig | 2 +-
arch/m68k/configs/atari_defconfig | 2 +-
arch/m68k/configs/bvme6000_defconfig | 2 +-
arch/m68k/configs/hp300_defconfig | 2 +-
arch/m68k/configs/mac_defconfig | 2 +-
arch/m68k/configs/multi_defconfig | 2 +-
arch/m68k/configs/mvme147_defconfig | 2 +-
arch/m68k/configs/mvme16x_defconfig | 2 +-
arch/m68k/configs/q40_defconfig | 2 +-
arch/m68k/configs/stmark2_defconfig | 2 +-
arch/m68k/configs/sun3_defconfig | 2 +-
arch/m68k/configs/sun3x_defconfig | 2 +-
arch/m68k/kernel/setup_mm.c | 12 +-
arch/m68k/kernel/setup_no.c | 12 +-
arch/m68k/kernel/uboot.c | 17 +-
arch/microblaze/kernel/cpu/mb.c | 2 +-
arch/microblaze/kernel/setup.c | 2 +-
arch/microblaze/mm/init.c | 12 +-
arch/mips/ath79/prom.c | 12 +-
arch/mips/configs/ath25_defconfig | 12 +-
arch/mips/configs/ath79_defconfig | 4 +-
arch/mips/configs/bcm47xx_defconfig | 2 +-
arch/mips/configs/bigsur_defconfig | 2 +-
arch/mips/configs/bmips_be_defconfig | 2 +-
arch/mips/configs/bmips_stb_defconfig | 14 +-
arch/mips/configs/cavium_octeon_defconfig | 2 +-
arch/mips/configs/eyeq5_defconfig | 2 +-
arch/mips/configs/eyeq6_defconfig | 2 +-
arch/mips/configs/generic_defconfig | 2 +-
arch/mips/configs/gpr_defconfig | 2 +-
arch/mips/configs/lemote2f_defconfig | 2 +-
arch/mips/configs/loongson2k_defconfig | 2 +-
arch/mips/configs/loongson3_defconfig | 2 +-
arch/mips/configs/malta_defconfig | 2 +-
arch/mips/configs/mtx1_defconfig | 2 +-
arch/mips/configs/rb532_defconfig | 2 +-
arch/mips/configs/rbtx49xx_defconfig | 2 +-
arch/mips/configs/rt305x_defconfig | 4 +-
arch/mips/configs/sb1250_swarm_defconfig | 2 +-
arch/mips/configs/xway_defconfig | 4 +-
arch/mips/kernel/setup.c | 53 ++-
arch/mips/mm/init.c | 2 +-
arch/mips/sibyte/common/cfe.c | 36 +-
arch/mips/sibyte/swarm/setup.c | 2 +-
arch/nios2/kernel/setup.c | 20 +-
arch/openrisc/configs/or1klitex_defconfig | 2 +-
arch/openrisc/configs/or1ksim_defconfig | 4 +-
arch/openrisc/configs/simple_smp_defconfig | 14 +-
arch/openrisc/configs/virt_defconfig | 2 +-
arch/openrisc/kernel/setup.c | 24 +-
arch/openrisc/kernel/vmlinux.h | 2 +-
arch/parisc/boot/compressed/misc.c | 2 +-
arch/parisc/configs/generic-32bit_defconfig | 2 +-
arch/parisc/configs/generic-64bit_defconfig | 2 +-
arch/parisc/defpalo.conf | 2 +-
arch/parisc/kernel/pdt.c | 6 +-
arch/parisc/kernel/setup.c | 8 +-
arch/parisc/mm/init.c | 32 +-
arch/powerpc/configs/44x/akebono_defconfig | 2 +-
arch/powerpc/configs/44x/arches_defconfig | 2 +-
arch/powerpc/configs/44x/bamboo_defconfig | 2 +-
arch/powerpc/configs/44x/bluestone_defconfig | 2 +-
.../powerpc/configs/44x/canyonlands_defconfig | 2 +-
arch/powerpc/configs/44x/ebony_defconfig | 2 +-
arch/powerpc/configs/44x/eiger_defconfig | 2 +-
arch/powerpc/configs/44x/fsp2_defconfig | 10 +-
arch/powerpc/configs/44x/icon_defconfig | 2 +-
arch/powerpc/configs/44x/iss476-smp_defconfig | 2 +-
arch/powerpc/configs/44x/katmai_defconfig | 2 +-
arch/powerpc/configs/44x/rainier_defconfig | 2 +-
arch/powerpc/configs/44x/redwood_defconfig | 2 +-
arch/powerpc/configs/44x/sam440ep_defconfig | 2 +-
arch/powerpc/configs/44x/sequoia_defconfig | 2 +-
arch/powerpc/configs/44x/taishan_defconfig | 2 +-
arch/powerpc/configs/44x/warp_defconfig | 2 +-
arch/powerpc/configs/52xx/cm5200_defconfig | 2 +-
arch/powerpc/configs/52xx/lite5200b_defconfig | 2 +-
arch/powerpc/configs/52xx/motionpro_defconfig | 2 +-
arch/powerpc/configs/52xx/tqm5200_defconfig | 2 +-
arch/powerpc/configs/83xx/asp8347_defconfig | 2 +-
.../configs/83xx/mpc8313_rdb_defconfig | 2 +-
.../configs/83xx/mpc8315_rdb_defconfig | 2 +-
.../configs/83xx/mpc832x_rdb_defconfig | 2 +-
.../configs/83xx/mpc834x_itx_defconfig | 2 +-
.../configs/83xx/mpc834x_itxgp_defconfig | 2 +-
.../configs/83xx/mpc836x_rdk_defconfig | 2 +-
.../configs/83xx/mpc837x_rdb_defconfig | 2 +-
arch/powerpc/configs/85xx/ge_imp3a_defconfig | 2 +-
arch/powerpc/configs/85xx/ksi8560_defconfig | 2 +-
arch/powerpc/configs/85xx/socrates_defconfig | 2 +-
arch/powerpc/configs/85xx/stx_gp3_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8540_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8541_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8548_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8555_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8560_defconfig | 2 +-
.../configs/85xx/xes_mpc85xx_defconfig | 2 +-
arch/powerpc/configs/amigaone_defconfig | 2 +-
arch/powerpc/configs/cell_defconfig | 2 +-
arch/powerpc/configs/chrp32_defconfig | 2 +-
arch/powerpc/configs/fsl-emb-nonhw.config | 2 +-
arch/powerpc/configs/g5_defconfig | 2 +-
arch/powerpc/configs/gamecube_defconfig | 2 +-
arch/powerpc/configs/holly_defconfig | 2 +-
arch/powerpc/configs/linkstation_defconfig | 2 +-
arch/powerpc/configs/mgcoge_defconfig | 4 +-
arch/powerpc/configs/microwatt_defconfig | 2 +-
arch/powerpc/configs/mpc512x_defconfig | 2 +-
arch/powerpc/configs/mpc5200_defconfig | 2 +-
arch/powerpc/configs/mpc83xx_defconfig | 2 +-
arch/powerpc/configs/pasemi_defconfig | 2 +-
arch/powerpc/configs/pmac32_defconfig | 2 +-
arch/powerpc/configs/powernv_defconfig | 2 +-
arch/powerpc/configs/ppc44x_defconfig | 2 +-
arch/powerpc/configs/ppc64_defconfig | 2 +-
arch/powerpc/configs/ppc64e_defconfig | 2 +-
arch/powerpc/configs/ppc6xx_defconfig | 2 +-
arch/powerpc/configs/ps3_defconfig | 2 +-
arch/powerpc/configs/skiroot_defconfig | 12 +-
arch/powerpc/configs/wii_defconfig | 2 +-
arch/powerpc/kernel/prom.c | 22 +-
arch/powerpc/kernel/prom_init.c | 6 +-
arch/powerpc/kernel/setup-common.c | 25 +-
arch/powerpc/kernel/setup_32.c | 2 +-
arch/powerpc/kernel/setup_64.c | 2 +-
arch/powerpc/mm/init_32.c | 2 +-
arch/powerpc/platforms/52xx/lite5200.c | 2 +-
arch/powerpc/platforms/83xx/km83xx.c | 2 +-
arch/powerpc/platforms/85xx/mpc85xx_mds.c | 2 +-
arch/powerpc/platforms/chrp/setup.c | 2 +-
.../platforms/embedded6xx/linkstation.c | 2 +-
.../platforms/embedded6xx/storcenter.c | 2 +-
arch/powerpc/platforms/powermac/setup.c | 8 +-
arch/riscv/configs/defconfig | 2 +-
arch/riscv/configs/nommu_k210_defconfig | 16 +-
arch/riscv/configs/nommu_virt_defconfig | 12 +-
arch/riscv/mm/init.c | 4 +-
arch/s390/boot/ipl_parm.c | 2 +-
arch/s390/boot/startup.c | 4 +-
arch/s390/configs/zfcpdump_defconfig | 2 +-
arch/s390/kernel/setup.c | 10 +-
arch/s390/mm/init.c | 2 +-
arch/sh/configs/apsh4a3a_defconfig | 2 +-
arch/sh/configs/apsh4ad0a_defconfig | 2 +-
arch/sh/configs/ecovec24-romimage_defconfig | 2 +-
arch/sh/configs/edosk7760_defconfig | 2 +-
arch/sh/configs/kfr2r09-romimage_defconfig | 2 +-
arch/sh/configs/kfr2r09_defconfig | 2 +-
arch/sh/configs/magicpanelr2_defconfig | 2 +-
arch/sh/configs/migor_defconfig | 2 +-
arch/sh/configs/rsk7201_defconfig | 2 +-
arch/sh/configs/rsk7203_defconfig | 2 +-
arch/sh/configs/sdk7786_defconfig | 8 +-
arch/sh/configs/se7206_defconfig | 2 +-
arch/sh/configs/se7705_defconfig | 2 +-
arch/sh/configs/se7722_defconfig | 2 +-
arch/sh/configs/se7751_defconfig | 2 +-
arch/sh/configs/secureedge5410_defconfig | 2 +-
arch/sh/configs/sh03_defconfig | 2 +-
arch/sh/configs/sh7757lcr_defconfig | 2 +-
arch/sh/configs/titan_defconfig | 2 +-
arch/sh/configs/ul2_defconfig | 2 +-
arch/sh/configs/urquell_defconfig | 2 +-
arch/sh/include/asm/setup.h | 1 -
arch/sh/kernel/head_32.S | 2 +-
arch/sh/kernel/setup.c | 27 +-
arch/sparc/boot/piggyback.c | 4 +-
arch/sparc/configs/sparc32_defconfig | 2 +-
arch/sparc/configs/sparc64_defconfig | 2 +-
arch/sparc/kernel/head_32.S | 4 +-
arch/sparc/kernel/head_64.S | 6 +-
arch/sparc/kernel/setup_32.c | 9 +-
arch/sparc/kernel/setup_64.c | 9 +-
arch/sparc/mm/init_32.c | 22 +-
arch/sparc/mm/init_64.c | 20 +-
arch/um/kernel/Makefile | 2 +-
arch/um/kernel/initrd.c | 6 +-
arch/x86/Kconfig | 2 +-
arch/x86/boot/header.S | 2 +-
arch/x86/boot/startup/sme.c | 2 +-
arch/x86/configs/i386_defconfig | 2 +-
arch/x86/configs/x86_64_defconfig | 2 +-
arch/x86/include/uapi/asm/bootparam.h | 7 +-
arch/x86/kernel/cpu/microcode/amd.c | 2 +-
arch/x86/kernel/cpu/microcode/core.c | 12 +-
arch/x86/kernel/cpu/microcode/intel.c | 2 +-
arch/x86/kernel/cpu/microcode/internal.h | 2 +-
arch/x86/kernel/devicetree.c | 2 +-
arch/x86/kernel/setup.c | 39 +-
arch/x86/mm/init.c | 8 +-
arch/x86/mm/init_32.c | 2 +-
arch/x86/mm/init_64.c | 2 +-
arch/x86/tools/relocs.c | 2 +-
arch/xtensa/Kconfig | 2 +-
arch/xtensa/boot/dts/csp.dts | 2 +-
arch/xtensa/configs/audio_kc705_defconfig | 2 +-
arch/xtensa/configs/cadence_csp_defconfig | 12 +-
arch/xtensa/configs/generic_kc705_defconfig | 2 +-
arch/xtensa/configs/nommu_kc705_defconfig | 12 +-
arch/xtensa/configs/smp_lx200_defconfig | 2 +-
arch/xtensa/configs/virt_defconfig | 2 +-
arch/xtensa/configs/xip_kc705_defconfig | 2 +-
arch/xtensa/kernel/setup.c | 26 +-
drivers/acpi/Kconfig | 2 +-
drivers/acpi/tables.c | 10 +-
drivers/base/firmware_loader/main.c | 2 +-
drivers/block/Kconfig | 8 +-
drivers/block/brd.c | 20 +-
drivers/firmware/efi/efi.c | 10 +-
.../firmware/efi/libstub/efi-stub-helper.c | 5 +-
drivers/gpu/drm/ci/arm.config | 2 +-
drivers/gpu/drm/ci/arm64.config | 2 +-
drivers/gpu/drm/ci/x86_64.config | 2 +-
drivers/of/fdt.c | 18 +-
fs/ext2/ext2.h | 9 -
fs/init.c | 14 -
include/asm-generic/vmlinux.lds.h | 8 +-
include/linux/ext2_fs.h | 13 -
include/linux/init_syscalls.h | 1 -
include/linux/initramfs.h | 26 ++
include/linux/initrd.h | 37 --
include/linux/root_dev.h | 1 -
include/linux/syscalls.h | 1 -
include/uapi/linux/sysctl.h | 1 -
init/.kunitconfig | 2 +-
init/Kconfig | 28 +-
init/Makefile | 6 +-
init/do_mounts.c | 28 +-
init/do_mounts.h | 42 --
init/do_mounts_initrd.c | 154 -------
init/do_mounts_rd.c | 334 ---------------
init/initramfs.c | 152 ++++---
init/main.c | 66 +--
kernel/sys.c | 7 +-
kernel/sysctl.c | 2 +-
kernel/umh.c | 2 +-
scripts/package/builddeb | 2 +-
.../ktest/examples/bootconfigs/tracing.bconf | 3 -
tools/testing/selftests/bpf/config.aarch64 | 2 +-
tools/testing/selftests/bpf/config.ppc64el | 2 +-
tools/testing/selftests/bpf/config.riscv64 | 2 +-
tools/testing/selftests/bpf/config.s390x | 2 +-
tools/testing/selftests/kho/vmtest.sh | 2 +-
.../testing/selftests/nolibc/Makefile.nolibc | 4 +-
tools/testing/selftests/vsock/config | 2 +-
.../selftests/wireguard/qemu/kernel.config | 2 +-
usr/Kconfig | 70 ++--
usr/Makefile | 2 +-
usr/initramfs_data.S | 4 +-
385 files changed, 969 insertions(+), 2346 deletions(-)
delete mode 100644 Documentation/admin-guide/initrd.rst
delete mode 100644 Documentation/power/swsusp-dmcrypt.rst
create mode 100644 include/linux/initramfs.h
delete mode 100644 include/linux/initrd.h
delete mode 100644 init/do_mounts_initrd.c
delete mode 100644 init/do_mounts_rd.c
base-commit: 76eeb9b8de9880ca38696b2fb56ac45ac0a25c6c
--
2.47.2
^ permalink raw reply
* [PATCH 01/62] init: remove deprecated "load_ramdisk" command line parameter, which does nothing
From: Askar Safin @ 2025-09-12 22:38 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250912223937.3735076-1-safinaskar@zohomail.com>
This is preparation for initrd removal
Signed-off-by: Askar Safin <safinaskar@zohomail.com>
---
Documentation/admin-guide/kernel-parameters.txt | 2 --
arch/arm/configs/neponset_defconfig | 2 +-
init/do_mounts.c | 7 -------
3 files changed, 1 insertion(+), 10 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 747a55abf494..d3b05ce249ff 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3275,8 +3275,6 @@
If there are multiple matching configurations changing
the same attribute, the last one is used.
- load_ramdisk= [RAM] [Deprecated]
-
lockd.nlm_grace_period=P [NFS] Assign grace period.
Format: <integer>
diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig
index 2227f86100ad..16f7300239da 100644
--- a/arch/arm/configs/neponset_defconfig
+++ b/arch/arm/configs/neponset_defconfig
@@ -9,7 +9,7 @@ CONFIG_ASSABET_NEPONSET=y
CONFIG_ZBOOT_ROM_TEXT=0x80000
CONFIG_ZBOOT_ROM_BSS=0xc1000000
CONFIG_ZBOOT_ROM=y
-CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) load_ramdisk=1 prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M"
+CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M"
CONFIG_FPE_NWFPE=y
CONFIG_PM=y
CONFIG_MODULES=y
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 6af29da8889e..0f2f44e6250c 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -34,13 +34,6 @@ static int root_wait;
dev_t ROOT_DEV;
-static int __init load_ramdisk(char *str)
-{
- pr_warn("ignoring the deprecated load_ramdisk= option\n");
- return 1;
-}
-__setup("load_ramdisk=", load_ramdisk);
-
static int __init readonly(char *str)
{
if (*str)
--
2.47.2
^ permalink raw reply related
* [PATCH 02/62] init: remove deprecated "prompt_ramdisk" command line parameter, which does nothing
From: Askar Safin @ 2025-09-12 22:38 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250912223937.3735076-1-safinaskar@zohomail.com>
This is preparation for initrd removal
Signed-off-by: Askar Safin <safinaskar@zohomail.com>
---
Documentation/admin-guide/kernel-parameters.txt | 2 --
arch/arm/configs/neponset_defconfig | 2 +-
init/do_mounts_rd.c | 7 -------
3 files changed, 1 insertion(+), 10 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index d3b05ce249ff..f940c1184912 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5229,8 +5229,6 @@
Param: <number> - step/bucket size as a power of 2 for
statistical time based profiling.
- prompt_ramdisk= [RAM] [Deprecated]
-
prot_virt= [S390] enable hosting protected virtual machines
isolated from the hypervisor (if hardware supports
that). If enabled, the default kernel base address
diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig
index 16f7300239da..4d720001c12e 100644
--- a/arch/arm/configs/neponset_defconfig
+++ b/arch/arm/configs/neponset_defconfig
@@ -9,7 +9,7 @@ CONFIG_ASSABET_NEPONSET=y
CONFIG_ZBOOT_ROM_TEXT=0x80000
CONFIG_ZBOOT_ROM_BSS=0xc1000000
CONFIG_ZBOOT_ROM=y
-CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M"
+CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) mem=32M noinitrd initrd=0xc0800000,3M"
CONFIG_FPE_NWFPE=y
CONFIG_PM=y
CONFIG_MODULES=y
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index ac021ae6e6fa..f7d53bc21e41 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -17,13 +17,6 @@
static struct file *in_file, *out_file;
static loff_t in_pos, out_pos;
-static int __init prompt_ramdisk(char *str)
-{
- pr_warn("ignoring the deprecated prompt_ramdisk= option\n");
- return 1;
-}
-__setup("prompt_ramdisk=", prompt_ramdisk);
-
int __initdata rd_image_start; /* starting block # of image */
static int __init ramdisk_start_setup(char *str)
--
2.47.2
^ permalink raw reply related
* [PATCH 03/62] init: sh, sparc, x86: remove unused constants RAMDISK_PROMPT_FLAG and RAMDISK_LOAD_FLAG
From: Askar Safin @ 2025-09-12 22:38 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches, stable+noautosel
In-Reply-To: <20250912223937.3735076-1-safinaskar@zohomail.com>
They were used for initrd before c8376994c86.
c8376994c86c made them unused and forgot to remove them
Fixes: c8376994c86c ("initrd: remove support for multiple floppies")
Cc: <stable+noautosel@kernel.org> # because changes uapi headers
Signed-off-by: Askar Safin <safinaskar@zohomail.com>
---
arch/sh/kernel/setup.c | 2 --
arch/sparc/kernel/setup_32.c | 2 --
arch/sparc/kernel/setup_64.c | 2 --
arch/x86/include/uapi/asm/bootparam.h | 2 --
arch/x86/kernel/setup.c | 2 --
5 files changed, 10 deletions(-)
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 039a51291002..d66f098e9e9f 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -71,8 +71,6 @@ EXPORT_SYMBOL(sh_mv);
extern int root_mountflags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index 704375c061e7..eb60be31127f 100644
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -172,8 +172,6 @@ extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
extern int root_mountflags;
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 63615f5c99b4..f728f1b00aca 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -145,8 +145,6 @@ extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
extern int root_mountflags;
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index dafbf581c515..f53dd3f319ba 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -6,8 +6,6 @@
/* ram_size flags */
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
/* loadflags */
#define LOADED_HIGH (1<<0)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1b2edd07a3e1..6409e766fb17 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -223,8 +223,6 @@ extern int root_mountflags;
unsigned long saved_video_mode;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE];
#ifdef CONFIG_CMDLINE_BOOL
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 00/62] initrd: remove classic initrd support
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
Intro
====
This patchset removes classic initrd (initial RAM disk) support,
which was deprecated in 2020.
Initramfs still stays, and RAM disk itself (brd) still stays, too.
init/do_mounts* and init/*initramfs* are listed in VFS entry in
MAINTAINERS, so I think this patchset should go through VFS tree.
This patchset touchs every subdirectory in arch/, so I tested it
on 8 (!!!) archs in Qemu (see details below).
Warning: this patchset renames CONFIG_BLK_DEV_INITRD (!!!) to CONFIG_INITRAMFS
and CONFIG_RD_* to CONFIG_INITRAMFS_DECOMPRESS_* (for example,
CONFIG_RD_GZIP to CONFIG_INITRAMFS_DECOMPRESS_GZIP).
If you still use initrd, see below for workaround.
Details
====
I not only removed initrd, I also removed a lot of code, which
became dead, including a lot of code in arch/.
Still I think the only two architectures I touched in non-trivial
way are sh and 32-bit arm.
Also I renamed some files, functions and variables (which became misnomers) to proper names,
moved some code around, removed a lot of mentions of initrd
in code and comments. Also I cleaned up some docs.
For example, I renamed the following global variables:
__initramfs_start
__initramfs_size
phys_initrd_start
phys_initrd_size
initrd_start
initrd_end
to:
__builtin_initramfs_start
__builtin_initramfs_size
phys_external_initramfs_start
phys_external_initramfs_size
virt_external_initramfs_start
virt_external_initramfs_end
New names precisely capture meaning of these variables.
Also I renamed CONFIG_BLK_DEV_INITRD (which became total misnomer)
to CONFIG_INITRAMFS. And CONFIG_RD_* to CONFIG_INITRAMFS_DECOMPRESS_*.
This will break all configs out there (update your configs!).
Still I think this is okay,
because config names never were part of stable API.
Still, I don't have strong opinion here, so I can drop these renamings
if needed.
Other user-visible changes:
- Removed kernel command line parameters "load_ramdisk" and
"prompt_ramdisk", which did nothing and were deprecated
- Removed kernel command line parameter "ramdisk_start",
which was used for initrd only (not for initramfs)
- Removed kernel command line parameter "noinitrd",
which was inconsistent: it controlled initrd only
(not initramfs), except for EFI boot, where it
controlled both initramfs and initrd. EFI users
still can disable initramfs simply by not passing it
- Removed kernel command line parameter "ramdisk_size",
which used for controlling ramdisk (brd), but only
in non-modular mode. Use brd.rd_size instead, it
always works
- Removed /proc/sys/kernel/real-root-dev . It was used
for initrd only
This patchset is based on v6.17-rc5.
Testing
====
I tested my patchset on many architectures in Qemu using my Rust
program, heavily based on mkroot [1].
I used the following cross-compilers:
aarch64-linux-musleabi
armv4l-linux-musleabihf
armv5l-linux-musleabihf
armv7l-linux-musleabihf
i486-linux-musl
i686-linux-musl
mips-linux-musl
mips64-linux-musl
mipsel-linux-musl
powerpc-linux-musl
powerpc64-linux-musl
powerpc64le-linux-musl
riscv32-linux-musl
riscv64-linux-musl
s390x-linux-musl
sh4-linux-musl
sh4eb-linux-musl
x86_64-linux-musl
taken from this directory [2].
So, as you can see, there are 18 triplets, which correspond to 8 subdirs in arch/.
And note that this list contains two archs (arm and sh) touched in non-trivial way.
For every triplet I tested that:
- Initramfs still works (both builtin and external)
- Direct boot from disk still works
Workaround
====
If "retain_initrd" is passed to kernel, then initramfs/initrd,
passed by bootloader, is retained and becomes available after boot
as read-only magic file /sys/firmware/initrd [3].
No copies are involved. I. e. /sys/firmware/initrd is simply
a reference to original blob passed by bootloader.
This works even if initrd/initramfs is not recognized by kernel
in any way, i. e. even if it is not valid cpio archive, nor
a fs image supported by classic initrd.
This works both with my patchset and without it.
This means that you can emulate classic initrd so:
link builtin initramfs to kernel. In /init in this initramfs
copy /sys/firmware/initrd to some file in / and loop-mount it.
This is even better than classic initrd, because:
- You can use fs not supported by classic initrd, for example erofs
- One copy is involved (from /sys/firmware/initrd to some file in /)
as opposed to two when using classic initrd
Still, I don't recommend using this workaround, because
I want everyone to migrate to proper modern initramfs.
But still you can use this workaround if you want.
Also: it is not possible to directly loop-mount
/sys/firmware/initrd . Theoretically kernel can be changed
to allow this (and/or to make it writable), but I think nobody needs this.
And I don't want to implement this.
P. S. When I sent this patchset first time, zoho mail banned me for
too much email. So I resend this using gmail. The only change is
email change, there are no other changes
[1] https://github.com/landley/toybox/tree/master/mkroot
[2] https://landley.net/toybox/downloads/binaries/toolchains/latest
[3] https://lore.kernel.org/all/20231207235654.16622-1-graf@amazon.com/
Askar Safin (62):
init: remove deprecated "load_ramdisk" command line parameter, which
does nothing
init: remove deprecated "prompt_ramdisk" command line parameter, which
does nothing
init: sh, sparc, x86: remove unused constants RAMDISK_PROMPT_FLAG and
RAMDISK_LOAD_FLAG
init: x86, arm, sh, sparc: remove variable rd_image_start, which
controls starting block number of initrd
init: remove "ramdisk_start" command line parameter, which controls
starting block number of initrd
arm: init: remove special logic for setting brd.rd_size
arm: init: remove ATAG_RAMDISK
arm: init: remove FLAG_RDLOAD and FLAG_RDPROMPT
arm: init: document rd_start (in param_struct) as obsolete
initrd: remove initrd (initial RAM disk) support
init, efi: remove "noinitrd" command line parameter
init: remove /proc/sys/kernel/real-root-dev
ext2: remove ext2_image_size and associated code
init: m68k, mips, powerpc, s390, sh: remove Root_RAM0
doc: modernize Documentation/admin-guide/blockdev/ramdisk.rst
brd: remove "ramdisk_size" command line parameter
doc: modernize Documentation/filesystems/ramfs-rootfs-initramfs.rst
doc: modernize
Documentation/driver-api/early-userspace/early_userspace_support.rst
init: remove mentions of "ramdisk=" command line parameter
doc: remove Documentation/power/swsusp-dmcrypt.rst
init: remove all mentions of root=/dev/ram*
doc: remove obsolete mentions of pivot_root
init: rename __initramfs_{start,size} to
__builtin_initramfs_{start,size}
init: remove wrong comment
init: rename phys_initrd_{start,size} to
phys_external_initramfs_{start,size}
init: move phys_external_initramfs_{start,size} to init/initramfs.c
init: alpha: remove "extern unsigned long initrd_start, initrd_end"
init: alpha, arc, arm, arm64, csky, m68k, microblaze, mips, nios2,
openrisc, parisc, powerpc, s390, sh, sparc, um, x86, xtensa: rename
initrd_{start,end} to virt_external_initramfs_{start,end}
init: move virt_external_initramfs_{start,end} to init/initramfs.c
doc: remove documentation for block device 4 0
init: rename initrd_below_start_ok to initramfs_below_start_ok
init: move initramfs_below_start_ok to init/initramfs.c
init: remove init/do_mounts_initrd.c
init: inline create_dev into the only caller
init: make mount_root_generic static
init: make mount_root static
init: remove root_mountflags from init/do_mounts.h
init: remove most headers from init/do_mounts.h
init: make console_on_rootfs static
init: rename free_initrd_mem to free_initramfs_mem
init: rename reserve_initrd_mem to reserve_initramfs_mem
init: rename <linux/initrd.h> to <linux/initramfs.h>
setsid: inline ksys_setsid into the only caller
doc: kernel-parameters: remove [RAM] from reserve_mem=
doc: kernel-parameters: replace [RAM] with [INITRAMFS]
init: edit docs for initramfs-related configs
init: fix typo: virtul => virtual
init: fix comment
init: rename ramdisk_execute_command to initramfs_execute_command
init: rename ramdisk_command_access to initramfs_command_access
init: rename get_boot_config_from_initrd to
get_boot_config_from_initramfs
init: rename do_retain_initrd to retain_initramfs
init: rename kexec_free_initrd to kexec_free_initramfs
init: arm, x86: deal with some references to initrd
init: rename CONFIG_BLK_DEV_INITRD to CONFIG_INITRAMFS
init: rename CONFIG_RD_GZIP to CONFIG_INITRAMFS_DECOMPRESS_GZIP
init: rename CONFIG_RD_BZIP2 to CONFIG_INITRAMFS_DECOMPRESS_BZIP2
init: rename CONFIG_RD_LZMA to CONFIG_INITRAMFS_DECOMPRESS_LZMA
init: rename CONFIG_RD_XZ to CONFIG_INITRAMFS_DECOMPRESS_XZ
init: rename CONFIG_RD_LZO to CONFIG_INITRAMFS_DECOMPRESS_LZO
init: rename CONFIG_RD_LZ4 to CONFIG_INITRAMFS_DECOMPRESS_LZ4
init: rename CONFIG_RD_ZSTD to CONFIG_INITRAMFS_DECOMPRESS_ZSTD
.../admin-guide/blockdev/ramdisk.rst | 104 +----
.../admin-guide/device-mapper/dm-init.rst | 4 +-
Documentation/admin-guide/devices.txt | 12 -
Documentation/admin-guide/index.rst | 1 -
Documentation/admin-guide/initrd.rst | 383 ------------------
.../admin-guide/kernel-parameters.rst | 4 +-
.../admin-guide/kernel-parameters.txt | 38 +-
Documentation/admin-guide/nfs/nfsroot.rst | 4 +-
Documentation/admin-guide/sysctl/kernel.rst | 6 -
Documentation/arch/arm/ixp4xx.rst | 4 +-
Documentation/arch/arm/setup.rst | 6 +-
Documentation/arch/m68k/kernel-options.rst | 29 +-
Documentation/arch/x86/boot.rst | 4 +-
.../early_userspace_support.rst | 18 +-
.../filesystems/ramfs-rootfs-initramfs.rst | 20 +-
Documentation/power/index.rst | 1 -
Documentation/power/swsusp-dmcrypt.rst | 140 -------
Documentation/security/ipe.rst | 2 +-
.../translations/zh_CN/power/index.rst | 1 -
arch/alpha/kernel/core_irongate.c | 12 +-
arch/alpha/kernel/proto.h | 2 +-
arch/alpha/kernel/setup.c | 32 +-
arch/arc/configs/axs101_defconfig | 2 +-
arch/arc/configs/axs103_defconfig | 2 +-
arch/arc/configs/axs103_smp_defconfig | 2 +-
arch/arc/configs/haps_hs_defconfig | 2 +-
arch/arc/configs/haps_hs_smp_defconfig | 2 +-
arch/arc/configs/hsdk_defconfig | 2 +-
arch/arc/configs/nsim_700_defconfig | 2 +-
arch/arc/configs/nsimosci_defconfig | 2 +-
arch/arc/configs/nsimosci_hs_defconfig | 2 +-
arch/arc/configs/nsimosci_hs_smp_defconfig | 2 +-
arch/arc/configs/tb10x_defconfig | 4 +-
arch/arc/configs/vdk_hs38_defconfig | 2 +-
arch/arc/configs/vdk_hs38_smp_defconfig | 2 +-
arch/arc/mm/init.c | 14 +-
arch/arm/Kconfig | 2 +-
arch/arm/boot/dts/arm/integratorap.dts | 2 +-
arch/arm/boot/dts/arm/integratorcp.dts | 2 +-
.../dts/aspeed/aspeed-bmc-facebook-cmm.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-galaxy100.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-minipack.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-wedge100.dts | 2 +-
.../aspeed/aspeed-bmc-facebook-wedge40.dts | 2 +-
.../dts/aspeed/aspeed-bmc-facebook-yamp.dts | 2 +-
.../ast2600-facebook-netbmc-common.dtsi | 2 +-
arch/arm/boot/dts/hisilicon/hi3620-hi4511.dts | 2 +-
.../ixp/intel-ixp42x-welltech-epbx100.dts | 2 +-
arch/arm/boot/dts/nspire/nspire-classic.dtsi | 2 +-
arch/arm/boot/dts/nspire/nspire-cx.dts | 2 +-
.../boot/dts/samsung/exynos4210-origen.dts | 2 +-
.../boot/dts/samsung/exynos4210-smdkv310.dts | 2 +-
.../boot/dts/samsung/exynos4412-smdk4412.dts | 2 +-
.../boot/dts/samsung/exynos5250-smdk5250.dts | 2 +-
arch/arm/boot/dts/st/ste-nomadik-nhk15.dts | 2 +-
arch/arm/boot/dts/st/ste-nomadik-s8815.dts | 2 +-
arch/arm/boot/dts/st/stm32429i-eval.dts | 2 +-
arch/arm/boot/dts/st/stm32746g-eval.dts | 2 +-
arch/arm/boot/dts/st/stm32f429-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32f469-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32f746-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32f769-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32h743i-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32h743i-eval.dts | 2 +-
arch/arm/boot/dts/st/stm32h747i-disco.dts | 2 +-
arch/arm/boot/dts/st/stm32h750i-art-pi.dts | 2 +-
arch/arm/configs/aspeed_g4_defconfig | 8 +-
arch/arm/configs/aspeed_g5_defconfig | 8 +-
arch/arm/configs/assabet_defconfig | 4 +-
arch/arm/configs/at91_dt_defconfig | 4 +-
arch/arm/configs/axm55xx_defconfig | 2 +-
arch/arm/configs/bcm2835_defconfig | 2 +-
arch/arm/configs/clps711x_defconfig | 4 +-
arch/arm/configs/collie_defconfig | 4 +-
arch/arm/configs/davinci_all_defconfig | 2 +-
arch/arm/configs/exynos_defconfig | 4 +-
arch/arm/configs/footbridge_defconfig | 2 +-
arch/arm/configs/gemini_defconfig | 2 +-
arch/arm/configs/h3600_defconfig | 2 +-
arch/arm/configs/hisi_defconfig | 4 +-
arch/arm/configs/imx_v4_v5_defconfig | 2 +-
arch/arm/configs/imx_v6_v7_defconfig | 4 +-
arch/arm/configs/integrator_defconfig | 2 +-
arch/arm/configs/ixp4xx_defconfig | 2 +-
arch/arm/configs/keystone_defconfig | 2 +-
arch/arm/configs/lpc18xx_defconfig | 12 +-
arch/arm/configs/lpc32xx_defconfig | 4 +-
arch/arm/configs/milbeaut_m10v_defconfig | 2 +-
arch/arm/configs/multi_v4t_defconfig | 2 +-
arch/arm/configs/multi_v5_defconfig | 2 +-
arch/arm/configs/multi_v7_defconfig | 2 +-
arch/arm/configs/mvebu_v7_defconfig | 2 +-
arch/arm/configs/mxs_defconfig | 2 +-
arch/arm/configs/neponset_defconfig | 4 +-
arch/arm/configs/nhk8815_defconfig | 2 +-
arch/arm/configs/omap1_defconfig | 2 +-
arch/arm/configs/omap2plus_defconfig | 2 +-
arch/arm/configs/pxa910_defconfig | 2 +-
arch/arm/configs/pxa_defconfig | 4 +-
arch/arm/configs/qcom_defconfig | 2 +-
arch/arm/configs/rpc_defconfig | 2 +-
arch/arm/configs/s3c6400_defconfig | 4 +-
arch/arm/configs/s5pv210_defconfig | 4 +-
arch/arm/configs/sama5_defconfig | 4 +-
arch/arm/configs/sama7_defconfig | 2 +-
arch/arm/configs/shmobile_defconfig | 2 +-
arch/arm/configs/socfpga_defconfig | 2 +-
arch/arm/configs/sp7021_defconfig | 12 +-
arch/arm/configs/spear13xx_defconfig | 2 +-
arch/arm/configs/spear3xx_defconfig | 2 +-
arch/arm/configs/spear6xx_defconfig | 2 +-
arch/arm/configs/spitz_defconfig | 2 +-
arch/arm/configs/stm32_defconfig | 2 +-
arch/arm/configs/sunxi_defconfig | 2 +-
arch/arm/configs/tegra_defconfig | 2 +-
arch/arm/configs/u8500_defconfig | 4 +-
arch/arm/configs/versatile_defconfig | 2 +-
arch/arm/configs/vexpress_defconfig | 2 +-
arch/arm/configs/vf610m4_defconfig | 10 +-
arch/arm/configs/vt8500_v6_v7_defconfig | 2 +-
arch/arm/configs/wpcm450_defconfig | 2 +-
arch/arm/include/uapi/asm/setup.h | 10 -
arch/arm/kernel/atags_compat.c | 10 -
arch/arm/kernel/atags_parse.c | 16 +-
arch/arm/kernel/setup.c | 2 +-
arch/arm/mm/init.c | 24 +-
arch/arm64/configs/defconfig | 2 +-
arch/arm64/kernel/setup.c | 2 +-
arch/arm64/mm/init.c | 17 +-
arch/csky/kernel/setup.c | 24 +-
arch/csky/mm/init.c | 2 +-
arch/hexagon/configs/comet_defconfig | 2 +-
arch/loongarch/configs/loongson3_defconfig | 2 +-
arch/loongarch/kernel/mem.c | 2 +-
arch/loongarch/kernel/setup.c | 4 +-
arch/m68k/configs/amiga_defconfig | 2 +-
arch/m68k/configs/apollo_defconfig | 2 +-
arch/m68k/configs/atari_defconfig | 2 +-
arch/m68k/configs/bvme6000_defconfig | 2 +-
arch/m68k/configs/hp300_defconfig | 2 +-
arch/m68k/configs/mac_defconfig | 2 +-
arch/m68k/configs/multi_defconfig | 2 +-
arch/m68k/configs/mvme147_defconfig | 2 +-
arch/m68k/configs/mvme16x_defconfig | 2 +-
arch/m68k/configs/q40_defconfig | 2 +-
arch/m68k/configs/stmark2_defconfig | 2 +-
arch/m68k/configs/sun3_defconfig | 2 +-
arch/m68k/configs/sun3x_defconfig | 2 +-
arch/m68k/kernel/setup_mm.c | 12 +-
arch/m68k/kernel/setup_no.c | 12 +-
arch/m68k/kernel/uboot.c | 17 +-
arch/microblaze/kernel/cpu/mb.c | 2 +-
arch/microblaze/kernel/setup.c | 2 +-
arch/microblaze/mm/init.c | 12 +-
arch/mips/ath79/prom.c | 12 +-
arch/mips/configs/ath25_defconfig | 12 +-
arch/mips/configs/ath79_defconfig | 4 +-
arch/mips/configs/bcm47xx_defconfig | 2 +-
arch/mips/configs/bigsur_defconfig | 2 +-
arch/mips/configs/bmips_be_defconfig | 2 +-
arch/mips/configs/bmips_stb_defconfig | 14 +-
arch/mips/configs/cavium_octeon_defconfig | 2 +-
arch/mips/configs/eyeq5_defconfig | 2 +-
arch/mips/configs/eyeq6_defconfig | 2 +-
arch/mips/configs/generic_defconfig | 2 +-
arch/mips/configs/gpr_defconfig | 2 +-
arch/mips/configs/lemote2f_defconfig | 2 +-
arch/mips/configs/loongson2k_defconfig | 2 +-
arch/mips/configs/loongson3_defconfig | 2 +-
arch/mips/configs/malta_defconfig | 2 +-
arch/mips/configs/mtx1_defconfig | 2 +-
arch/mips/configs/rb532_defconfig | 2 +-
arch/mips/configs/rbtx49xx_defconfig | 2 +-
arch/mips/configs/rt305x_defconfig | 4 +-
arch/mips/configs/sb1250_swarm_defconfig | 2 +-
arch/mips/configs/xway_defconfig | 4 +-
arch/mips/kernel/setup.c | 53 ++-
arch/mips/mm/init.c | 2 +-
arch/mips/sibyte/common/cfe.c | 36 +-
arch/mips/sibyte/swarm/setup.c | 2 +-
arch/nios2/kernel/setup.c | 20 +-
arch/openrisc/configs/or1klitex_defconfig | 2 +-
arch/openrisc/configs/or1ksim_defconfig | 4 +-
arch/openrisc/configs/simple_smp_defconfig | 14 +-
arch/openrisc/configs/virt_defconfig | 2 +-
arch/openrisc/kernel/setup.c | 24 +-
arch/openrisc/kernel/vmlinux.h | 2 +-
arch/parisc/boot/compressed/misc.c | 2 +-
arch/parisc/configs/generic-32bit_defconfig | 2 +-
arch/parisc/configs/generic-64bit_defconfig | 2 +-
arch/parisc/defpalo.conf | 2 +-
arch/parisc/kernel/pdt.c | 6 +-
arch/parisc/kernel/setup.c | 8 +-
arch/parisc/mm/init.c | 32 +-
arch/powerpc/configs/44x/akebono_defconfig | 2 +-
arch/powerpc/configs/44x/arches_defconfig | 2 +-
arch/powerpc/configs/44x/bamboo_defconfig | 2 +-
arch/powerpc/configs/44x/bluestone_defconfig | 2 +-
.../powerpc/configs/44x/canyonlands_defconfig | 2 +-
arch/powerpc/configs/44x/ebony_defconfig | 2 +-
arch/powerpc/configs/44x/eiger_defconfig | 2 +-
arch/powerpc/configs/44x/fsp2_defconfig | 10 +-
arch/powerpc/configs/44x/icon_defconfig | 2 +-
arch/powerpc/configs/44x/iss476-smp_defconfig | 2 +-
arch/powerpc/configs/44x/katmai_defconfig | 2 +-
arch/powerpc/configs/44x/rainier_defconfig | 2 +-
arch/powerpc/configs/44x/redwood_defconfig | 2 +-
arch/powerpc/configs/44x/sam440ep_defconfig | 2 +-
arch/powerpc/configs/44x/sequoia_defconfig | 2 +-
arch/powerpc/configs/44x/taishan_defconfig | 2 +-
arch/powerpc/configs/44x/warp_defconfig | 2 +-
arch/powerpc/configs/52xx/cm5200_defconfig | 2 +-
arch/powerpc/configs/52xx/lite5200b_defconfig | 2 +-
arch/powerpc/configs/52xx/motionpro_defconfig | 2 +-
arch/powerpc/configs/52xx/tqm5200_defconfig | 2 +-
arch/powerpc/configs/83xx/asp8347_defconfig | 2 +-
.../configs/83xx/mpc8313_rdb_defconfig | 2 +-
.../configs/83xx/mpc8315_rdb_defconfig | 2 +-
.../configs/83xx/mpc832x_rdb_defconfig | 2 +-
.../configs/83xx/mpc834x_itx_defconfig | 2 +-
.../configs/83xx/mpc834x_itxgp_defconfig | 2 +-
.../configs/83xx/mpc836x_rdk_defconfig | 2 +-
.../configs/83xx/mpc837x_rdb_defconfig | 2 +-
arch/powerpc/configs/85xx/ge_imp3a_defconfig | 2 +-
arch/powerpc/configs/85xx/ksi8560_defconfig | 2 +-
arch/powerpc/configs/85xx/socrates_defconfig | 2 +-
arch/powerpc/configs/85xx/stx_gp3_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8540_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8541_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8548_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8555_defconfig | 2 +-
arch/powerpc/configs/85xx/tqm8560_defconfig | 2 +-
.../configs/85xx/xes_mpc85xx_defconfig | 2 +-
arch/powerpc/configs/amigaone_defconfig | 2 +-
arch/powerpc/configs/cell_defconfig | 2 +-
arch/powerpc/configs/chrp32_defconfig | 2 +-
arch/powerpc/configs/fsl-emb-nonhw.config | 2 +-
arch/powerpc/configs/g5_defconfig | 2 +-
arch/powerpc/configs/gamecube_defconfig | 2 +-
arch/powerpc/configs/holly_defconfig | 2 +-
arch/powerpc/configs/linkstation_defconfig | 2 +-
arch/powerpc/configs/mgcoge_defconfig | 4 +-
arch/powerpc/configs/microwatt_defconfig | 2 +-
arch/powerpc/configs/mpc512x_defconfig | 2 +-
arch/powerpc/configs/mpc5200_defconfig | 2 +-
arch/powerpc/configs/mpc83xx_defconfig | 2 +-
arch/powerpc/configs/pasemi_defconfig | 2 +-
arch/powerpc/configs/pmac32_defconfig | 2 +-
arch/powerpc/configs/powernv_defconfig | 2 +-
arch/powerpc/configs/ppc44x_defconfig | 2 +-
arch/powerpc/configs/ppc64_defconfig | 2 +-
arch/powerpc/configs/ppc64e_defconfig | 2 +-
arch/powerpc/configs/ppc6xx_defconfig | 2 +-
arch/powerpc/configs/ps3_defconfig | 2 +-
arch/powerpc/configs/skiroot_defconfig | 12 +-
arch/powerpc/configs/wii_defconfig | 2 +-
arch/powerpc/kernel/prom.c | 22 +-
arch/powerpc/kernel/prom_init.c | 6 +-
arch/powerpc/kernel/setup-common.c | 25 +-
arch/powerpc/kernel/setup_32.c | 2 +-
arch/powerpc/kernel/setup_64.c | 2 +-
arch/powerpc/mm/init_32.c | 2 +-
arch/powerpc/platforms/52xx/lite5200.c | 2 +-
arch/powerpc/platforms/83xx/km83xx.c | 2 +-
arch/powerpc/platforms/85xx/mpc85xx_mds.c | 2 +-
arch/powerpc/platforms/chrp/setup.c | 2 +-
.../platforms/embedded6xx/linkstation.c | 2 +-
.../platforms/embedded6xx/storcenter.c | 2 +-
arch/powerpc/platforms/powermac/setup.c | 8 +-
arch/riscv/configs/defconfig | 2 +-
arch/riscv/configs/nommu_k210_defconfig | 16 +-
arch/riscv/configs/nommu_virt_defconfig | 12 +-
arch/riscv/mm/init.c | 4 +-
arch/s390/boot/ipl_parm.c | 2 +-
arch/s390/boot/startup.c | 4 +-
arch/s390/configs/zfcpdump_defconfig | 2 +-
arch/s390/kernel/setup.c | 10 +-
arch/s390/mm/init.c | 2 +-
arch/sh/configs/apsh4a3a_defconfig | 2 +-
arch/sh/configs/apsh4ad0a_defconfig | 2 +-
arch/sh/configs/ecovec24-romimage_defconfig | 2 +-
arch/sh/configs/edosk7760_defconfig | 2 +-
arch/sh/configs/kfr2r09-romimage_defconfig | 2 +-
arch/sh/configs/kfr2r09_defconfig | 2 +-
arch/sh/configs/magicpanelr2_defconfig | 2 +-
arch/sh/configs/migor_defconfig | 2 +-
arch/sh/configs/rsk7201_defconfig | 2 +-
arch/sh/configs/rsk7203_defconfig | 2 +-
arch/sh/configs/sdk7786_defconfig | 8 +-
arch/sh/configs/se7206_defconfig | 2 +-
arch/sh/configs/se7705_defconfig | 2 +-
arch/sh/configs/se7722_defconfig | 2 +-
arch/sh/configs/se7751_defconfig | 2 +-
arch/sh/configs/secureedge5410_defconfig | 2 +-
arch/sh/configs/sh03_defconfig | 2 +-
arch/sh/configs/sh7757lcr_defconfig | 2 +-
arch/sh/configs/titan_defconfig | 2 +-
arch/sh/configs/ul2_defconfig | 2 +-
arch/sh/configs/urquell_defconfig | 2 +-
arch/sh/include/asm/setup.h | 1 -
arch/sh/kernel/head_32.S | 2 +-
arch/sh/kernel/setup.c | 27 +-
arch/sparc/boot/piggyback.c | 4 +-
arch/sparc/configs/sparc32_defconfig | 2 +-
arch/sparc/configs/sparc64_defconfig | 2 +-
arch/sparc/kernel/head_32.S | 4 +-
arch/sparc/kernel/head_64.S | 6 +-
arch/sparc/kernel/setup_32.c | 9 +-
arch/sparc/kernel/setup_64.c | 9 +-
arch/sparc/mm/init_32.c | 22 +-
arch/sparc/mm/init_64.c | 20 +-
arch/um/kernel/Makefile | 2 +-
arch/um/kernel/initrd.c | 6 +-
arch/x86/Kconfig | 2 +-
arch/x86/boot/header.S | 2 +-
arch/x86/boot/startup/sme.c | 2 +-
arch/x86/configs/i386_defconfig | 2 +-
arch/x86/configs/x86_64_defconfig | 2 +-
arch/x86/include/uapi/asm/bootparam.h | 7 +-
arch/x86/kernel/cpu/microcode/amd.c | 2 +-
arch/x86/kernel/cpu/microcode/core.c | 12 +-
arch/x86/kernel/cpu/microcode/intel.c | 2 +-
arch/x86/kernel/cpu/microcode/internal.h | 2 +-
arch/x86/kernel/devicetree.c | 2 +-
arch/x86/kernel/setup.c | 39 +-
arch/x86/mm/init.c | 8 +-
arch/x86/mm/init_32.c | 2 +-
arch/x86/mm/init_64.c | 2 +-
arch/x86/tools/relocs.c | 2 +-
arch/xtensa/Kconfig | 2 +-
arch/xtensa/boot/dts/csp.dts | 2 +-
arch/xtensa/configs/audio_kc705_defconfig | 2 +-
arch/xtensa/configs/cadence_csp_defconfig | 12 +-
arch/xtensa/configs/generic_kc705_defconfig | 2 +-
arch/xtensa/configs/nommu_kc705_defconfig | 12 +-
arch/xtensa/configs/smp_lx200_defconfig | 2 +-
arch/xtensa/configs/virt_defconfig | 2 +-
arch/xtensa/configs/xip_kc705_defconfig | 2 +-
arch/xtensa/kernel/setup.c | 26 +-
drivers/acpi/Kconfig | 2 +-
drivers/acpi/tables.c | 10 +-
drivers/base/firmware_loader/main.c | 2 +-
drivers/block/Kconfig | 8 +-
drivers/block/brd.c | 20 +-
drivers/firmware/efi/efi.c | 10 +-
.../firmware/efi/libstub/efi-stub-helper.c | 5 +-
drivers/gpu/drm/ci/arm.config | 2 +-
drivers/gpu/drm/ci/arm64.config | 2 +-
drivers/gpu/drm/ci/x86_64.config | 2 +-
drivers/of/fdt.c | 18 +-
fs/ext2/ext2.h | 9 -
fs/init.c | 14 -
include/asm-generic/vmlinux.lds.h | 8 +-
include/linux/ext2_fs.h | 13 -
include/linux/init_syscalls.h | 1 -
include/linux/initramfs.h | 26 ++
include/linux/initrd.h | 37 --
include/linux/root_dev.h | 1 -
include/linux/syscalls.h | 1 -
include/uapi/linux/sysctl.h | 1 -
init/.kunitconfig | 2 +-
init/Kconfig | 28 +-
init/Makefile | 6 +-
init/do_mounts.c | 28 +-
init/do_mounts.h | 42 --
init/do_mounts_initrd.c | 154 -------
init/do_mounts_rd.c | 334 ---------------
init/initramfs.c | 152 ++++---
init/main.c | 66 +--
kernel/sys.c | 7 +-
kernel/sysctl.c | 2 +-
kernel/umh.c | 2 +-
scripts/package/builddeb | 2 +-
.../ktest/examples/bootconfigs/tracing.bconf | 3 -
tools/testing/selftests/bpf/config.aarch64 | 2 +-
tools/testing/selftests/bpf/config.ppc64el | 2 +-
tools/testing/selftests/bpf/config.riscv64 | 2 +-
tools/testing/selftests/bpf/config.s390x | 2 +-
tools/testing/selftests/kho/vmtest.sh | 2 +-
.../testing/selftests/nolibc/Makefile.nolibc | 4 +-
tools/testing/selftests/vsock/config | 2 +-
.../selftests/wireguard/qemu/kernel.config | 2 +-
usr/Kconfig | 70 ++--
usr/Makefile | 2 +-
usr/initramfs_data.S | 4 +-
385 files changed, 969 insertions(+), 2346 deletions(-)
delete mode 100644 Documentation/admin-guide/initrd.rst
delete mode 100644 Documentation/power/swsusp-dmcrypt.rst
create mode 100644 include/linux/initramfs.h
delete mode 100644 include/linux/initrd.h
delete mode 100644 init/do_mounts_initrd.c
delete mode 100644 init/do_mounts_rd.c
base-commit: 76eeb9b8de9880ca38696b2fb56ac45ac0a25c6c
--
2.47.2
^ permalink raw reply
* [PATCH RESEND 01/62] init: remove deprecated "load_ramdisk" command line parameter, which does nothing
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
This is preparation for initrd removal
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/admin-guide/kernel-parameters.txt | 2 --
arch/arm/configs/neponset_defconfig | 2 +-
init/do_mounts.c | 7 -------
3 files changed, 1 insertion(+), 10 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 747a55abf494..d3b05ce249ff 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3275,8 +3275,6 @@
If there are multiple matching configurations changing
the same attribute, the last one is used.
- load_ramdisk= [RAM] [Deprecated]
-
lockd.nlm_grace_period=P [NFS] Assign grace period.
Format: <integer>
diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig
index 2227f86100ad..16f7300239da 100644
--- a/arch/arm/configs/neponset_defconfig
+++ b/arch/arm/configs/neponset_defconfig
@@ -9,7 +9,7 @@ CONFIG_ASSABET_NEPONSET=y
CONFIG_ZBOOT_ROM_TEXT=0x80000
CONFIG_ZBOOT_ROM_BSS=0xc1000000
CONFIG_ZBOOT_ROM=y
-CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) load_ramdisk=1 prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M"
+CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M"
CONFIG_FPE_NWFPE=y
CONFIG_PM=y
CONFIG_MODULES=y
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 6af29da8889e..0f2f44e6250c 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -34,13 +34,6 @@ static int root_wait;
dev_t ROOT_DEV;
-static int __init load_ramdisk(char *str)
-{
- pr_warn("ignoring the deprecated load_ramdisk= option\n");
- return 1;
-}
-__setup("load_ramdisk=", load_ramdisk);
-
static int __init readonly(char *str)
{
if (*str)
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 02/62] init: remove deprecated "prompt_ramdisk" command line parameter, which does nothing
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
This is preparation for initrd removal
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/admin-guide/kernel-parameters.txt | 2 --
arch/arm/configs/neponset_defconfig | 2 +-
init/do_mounts_rd.c | 7 -------
3 files changed, 1 insertion(+), 10 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index d3b05ce249ff..f940c1184912 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5229,8 +5229,6 @@
Param: <number> - step/bucket size as a power of 2 for
statistical time based profiling.
- prompt_ramdisk= [RAM] [Deprecated]
-
prot_virt= [S390] enable hosting protected virtual machines
isolated from the hypervisor (if hardware supports
that). If enabled, the default kernel base address
diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig
index 16f7300239da..4d720001c12e 100644
--- a/arch/arm/configs/neponset_defconfig
+++ b/arch/arm/configs/neponset_defconfig
@@ -9,7 +9,7 @@ CONFIG_ASSABET_NEPONSET=y
CONFIG_ZBOOT_ROM_TEXT=0x80000
CONFIG_ZBOOT_ROM_BSS=0xc1000000
CONFIG_ZBOOT_ROM=y
-CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M"
+CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) mem=32M noinitrd initrd=0xc0800000,3M"
CONFIG_FPE_NWFPE=y
CONFIG_PM=y
CONFIG_MODULES=y
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index ac021ae6e6fa..f7d53bc21e41 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -17,13 +17,6 @@
static struct file *in_file, *out_file;
static loff_t in_pos, out_pos;
-static int __init prompt_ramdisk(char *str)
-{
- pr_warn("ignoring the deprecated prompt_ramdisk= option\n");
- return 1;
-}
-__setup("prompt_ramdisk=", prompt_ramdisk);
-
int __initdata rd_image_start; /* starting block # of image */
static int __init ramdisk_start_setup(char *str)
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 03/62] init: sh, sparc, x86: remove unused constants RAMDISK_PROMPT_FLAG and RAMDISK_LOAD_FLAG
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches, stable+noautosel
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
They were used for initrd before c8376994c86.
c8376994c86c made them unused and forgot to remove them
Fixes: c8376994c86c ("initrd: remove support for multiple floppies")
Cc: <stable+noautosel@kernel.org> # because changes uapi headers
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
arch/sh/kernel/setup.c | 2 --
arch/sparc/kernel/setup_32.c | 2 --
arch/sparc/kernel/setup_64.c | 2 --
arch/x86/include/uapi/asm/bootparam.h | 2 --
arch/x86/kernel/setup.c | 2 --
5 files changed, 10 deletions(-)
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 039a51291002..d66f098e9e9f 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -71,8 +71,6 @@ EXPORT_SYMBOL(sh_mv);
extern int root_mountflags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index 704375c061e7..eb60be31127f 100644
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -172,8 +172,6 @@ extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
extern int root_mountflags;
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 63615f5c99b4..f728f1b00aca 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -145,8 +145,6 @@ extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
extern int root_mountflags;
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index dafbf581c515..f53dd3f319ba 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -6,8 +6,6 @@
/* ram_size flags */
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
/* loadflags */
#define LOADED_HIGH (1<<0)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1b2edd07a3e1..6409e766fb17 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -223,8 +223,6 @@ extern int root_mountflags;
unsigned long saved_video_mode;
#define RAMDISK_IMAGE_START_MASK 0x07FF
-#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE];
#ifdef CONFIG_CMDLINE_BOOL
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 04/62] init: x86, arm, sh, sparc: remove variable rd_image_start, which controls starting block number of initrd
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
This is preparation for initrd removal
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/arch/x86/boot.rst | 4 ++--
arch/arm/kernel/atags_parse.c | 2 --
arch/sh/include/asm/setup.h | 1 -
arch/sh/kernel/head_32.S | 2 +-
arch/sh/kernel/setup.c | 9 +--------
arch/sparc/boot/piggyback.c | 4 ++--
arch/sparc/kernel/head_32.S | 4 ++--
arch/sparc/kernel/head_64.S | 6 ++++--
arch/sparc/kernel/setup_32.c | 5 -----
arch/sparc/kernel/setup_64.c | 5 -----
| 2 +-
arch/x86/include/uapi/asm/bootparam.h | 5 +----
arch/x86/kernel/setup.c | 5 -----
include/linux/initrd.h | 3 ---
init/do_mounts_rd.c | 8 +++-----
15 files changed, 17 insertions(+), 48 deletions(-)
diff --git a/Documentation/arch/x86/boot.rst b/Documentation/arch/x86/boot.rst
index 77e6163288db..118aa7b69667 100644
--- a/Documentation/arch/x86/boot.rst
+++ b/Documentation/arch/x86/boot.rst
@@ -189,7 +189,7 @@ Offset/Size Proto Name Meaning
01F1/1 ALL(1) setup_sects The size of the setup in sectors
01F2/2 ALL root_flags If set, the root is mounted readonly
01F4/4 2.04+(2) syssize The size of the 32-bit code in 16-byte paras
-01F8/2 ALL ram_size DO NOT USE - for bootsect.S use only
+01F8/2 ALL ram_size DO NOT USE - for bootsect.S use only - used to control initrd, which was removed from Linux in 2025
01FA/2 ALL vid_mode Video mode control
01FC/2 ALL root_dev Default root device number
01FE/2 ALL boot_flag 0xAA55 magic number
@@ -308,7 +308,7 @@ Offset/size: 0x1f8/2
Protocol: ALL
============ ===============
- This field is obsolete.
+ This field is obsolete. Used to control initrd, which was removed from Linux in 2025.
============ ===================
Field name: vid_mode
diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index 4ec591bde3df..a3f0a4f84e04 100644
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -90,8 +90,6 @@ __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
#ifdef CONFIG_BLK_DEV_RAM
static int __init parse_tag_ramdisk(const struct tag *tag)
{
- rd_image_start = tag->u.ramdisk.start;
-
if (tag->u.ramdisk.size)
rd_size = tag->u.ramdisk.size;
diff --git a/arch/sh/include/asm/setup.h b/arch/sh/include/asm/setup.h
index 84bb23a771f3..d1b97c5726e4 100644
--- a/arch/sh/include/asm/setup.h
+++ b/arch/sh/include/asm/setup.h
@@ -10,7 +10,6 @@
#define PARAM ((unsigned char *)empty_zero_page)
#define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
-#define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
#define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
#define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
#define INITRD_START (*(unsigned long *) (PARAM+0x010))
diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index b603b7968b38..4382c0f058c8 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -28,7 +28,7 @@
.section .empty_zero_page, "aw"
ENTRY(empty_zero_page)
.long 1 /* MOUNT_ROOT_RDONLY */
- .long 0 /* RAMDISK_FLAGS */
+ .long 0 /* RAMDISK_FLAGS - used to control initrd, which was removed from Linux in 2025 */
.long 0x0200 /* ORIG_ROOT_DEV */
.long 1 /* LOADER_TYPE */
.long 0x00000000 /* INITRD_START */
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index d66f098e9e9f..50f1d39fe34f 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -70,8 +70,6 @@ EXPORT_SYMBOL(sh_mv);
extern int root_mountflags;
-#define RAMDISK_IMAGE_START_MASK 0x07FF
-
static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
static struct resource code_resource = {
@@ -273,19 +271,14 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_NOTICE "Boot params:\n"
"... MOUNT_ROOT_RDONLY - %08lx\n"
- "... RAMDISK_FLAGS - %08lx\n"
"... ORIG_ROOT_DEV - %08lx\n"
"... LOADER_TYPE - %08lx\n"
"... INITRD_START - %08lx\n"
"... INITRD_SIZE - %08lx\n",
- MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
+ MOUNT_ROOT_RDONLY,
ORIG_ROOT_DEV, LOADER_TYPE,
INITRD_START, INITRD_SIZE);
-#ifdef CONFIG_BLK_DEV_RAM
- rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
-#endif
-
if (!MOUNT_ROOT_RDONLY)
root_mountflags &= ~MS_RDONLY;
setup_initial_init_mm(_text, _etext, _edata, _end);
diff --git a/arch/sparc/boot/piggyback.c b/arch/sparc/boot/piggyback.c
index 6d74064add0a..a9cc55254ff8 100644
--- a/arch/sparc/boot/piggyback.c
+++ b/arch/sparc/boot/piggyback.c
@@ -220,8 +220,8 @@ int main(int argc,char **argv)
/*
* root_flags = 0
- * root_dev = 1 (RAMDISK_MAJOR)
- * ram_flags = 0
+ * root_dev = 1 (1 used to mean RAMDISK_MAJOR, i. e. initrd, which was removed from Linux)
+ * ram_flags = 0 (used to control initrd, which was removed from Linux in 2025)
* sparc_ramdisk_image = "PAGE aligned address after _end")
* sparc_ramdisk_size = size of image
*/
diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S
index 38345460d542..46f0e39b9037 100644
--- a/arch/sparc/kernel/head_32.S
+++ b/arch/sparc/kernel/head_32.S
@@ -65,7 +65,7 @@ empty_zero_page: .skip PAGE_SIZE
EXPORT_SYMBOL(empty_zero_page)
.global root_flags
- .global ram_flags
+ .global ram_flags /* used to control initrd, which was removed from Linux in 2025 */
.global root_dev
.global sparc_ramdisk_image
.global sparc_ramdisk_size
@@ -81,7 +81,7 @@ root_flags:
.half 1
root_dev:
.half 0
-ram_flags:
+ram_flags: /* used to control initrd, which was removed from Linux in 2025 */
.half 0
sparc_ramdisk_image:
.word 0
diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
index cf0549134234..4480c0532fe9 100644
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -52,7 +52,9 @@ stext:
* Fields should be kept upward compatible and whenever any change is made,
* HdrS version should be incremented.
*/
- .global root_flags, ram_flags, root_dev
+ .global root_flags
+ .global ram_flags /* used to control initrd, which was removed from Linux in 2025 */
+ .global root_dev
.global sparc_ramdisk_image, sparc_ramdisk_size
.global sparc_ramdisk_image64
@@ -71,7 +73,7 @@ root_flags:
.half 1
root_dev:
.half 0
-ram_flags:
+ram_flags: /* used to control initrd, which was removed from Linux in 2025 */
.half 0
sparc_ramdisk_image:
.word 0
diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index eb60be31127f..fb46fb3acf54 100644
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -170,8 +170,6 @@ static void __init boot_flags_init(char *commands)
extern unsigned short root_flags;
extern unsigned short root_dev;
-extern unsigned short ram_flags;
-#define RAMDISK_IMAGE_START_MASK 0x07FF
extern int root_mountflags;
@@ -335,9 +333,6 @@ void __init setup_arch(char **cmdline_p)
if (!root_flags)
root_mountflags &= ~MS_RDONLY;
ROOT_DEV = old_decode_dev(root_dev);
-#ifdef CONFIG_BLK_DEV_RAM
- rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
-#endif
prom_setsync(prom_sync_me);
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index f728f1b00aca..79b56613c6d8 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -143,8 +143,6 @@ static void __init boot_flags_init(char *commands)
extern unsigned short root_flags;
extern unsigned short root_dev;
-extern unsigned short ram_flags;
-#define RAMDISK_IMAGE_START_MASK 0x07FF
extern int root_mountflags;
@@ -640,9 +638,6 @@ void __init setup_arch(char **cmdline_p)
if (!root_flags)
root_mountflags &= ~MS_RDONLY;
ROOT_DEV = old_decode_dev(root_dev);
-#ifdef CONFIG_BLK_DEV_RAM
- rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
-#endif
#ifdef CONFIG_IP_PNP
if (!ic_set_manually) {
--git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 9bea5a1e2c52..0ced2e9f100e 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -235,7 +235,7 @@ hdr:
.byte setup_sects - 1
root_flags: .word ROOT_RDONLY
syssize: .long ZO__edata / 16
-ram_size: .word 0 /* Obsolete */
+ram_size: .word 0 /* Used to control initrd, which was removed from Linux in 2025 */
vid_mode: .word SVGA_MODE
root_dev: .word 0 /* Default to major/minor 0/0 */
boot_flag: .word 0xAA55
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index f53dd3f319ba..bf56549f79bb 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -4,9 +4,6 @@
#include <asm/setup_data.h>
-/* ram_size flags */
-#define RAMDISK_IMAGE_START_MASK 0x07FF
-
/* loadflags */
#define LOADED_HIGH (1<<0)
#define KASLR_FLAG (1<<1)
@@ -37,7 +34,7 @@ struct setup_header {
__u8 setup_sects;
__u16 root_flags;
__u32 syssize;
- __u16 ram_size;
+ __u16 ram_size; /* used to control initrd, which was removed from Linux in 2025 */
__u16 vid_mode;
__u16 root_dev;
__u16 boot_flag;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 6409e766fb17..797c3c9fc75e 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -222,8 +222,6 @@ extern int root_mountflags;
unsigned long saved_video_mode;
-#define RAMDISK_IMAGE_START_MASK 0x07FF
-
static char __initdata command_line[COMMAND_LINE_SIZE];
#ifdef CONFIG_CMDLINE_BOOL
char builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
@@ -541,9 +539,6 @@ static void __init parse_boot_params(void)
bootloader_version = bootloader_type & 0xf;
bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
-#ifdef CONFIG_BLK_DEV_RAM
- rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
-#endif
#ifdef CONFIG_EFI
if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
EFI32_LOADER_SIGNATURE, 4)) {
diff --git a/include/linux/initrd.h b/include/linux/initrd.h
index f1a1f4c92ded..6320a9cb6686 100644
--- a/include/linux/initrd.h
+++ b/include/linux/initrd.h
@@ -5,9 +5,6 @@
#define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
-/* starting block # of image */
-extern int rd_image_start;
-
/* size of a single RAM disk */
extern unsigned long rd_size;
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index f7d53bc21e41..8e0a774a9c6f 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -17,11 +17,9 @@
static struct file *in_file, *out_file;
static loff_t in_pos, out_pos;
-int __initdata rd_image_start; /* starting block # of image */
-
static int __init ramdisk_start_setup(char *str)
{
- rd_image_start = simple_strtol(str,NULL,0);
+ /* will be removed in next commit */
return 1;
}
__setup("ramdisk_start=", ramdisk_start_setup);
@@ -60,7 +58,7 @@ identify_ramdisk_image(struct file *file, loff_t pos,
unsigned char *buf;
const char *compress_name;
unsigned long n;
- int start_block = rd_image_start;
+ int start_block = 0;
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
@@ -196,7 +194,7 @@ int __init rd_load_image(char *from)
if (IS_ERR(in_file))
goto noclose_input;
- in_pos = rd_image_start * BLOCK_SIZE;
+ in_pos = 0;
nblocks = identify_ramdisk_image(in_file, in_pos, &decompressor);
if (nblocks < 0)
goto done;
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 05/62] init: remove "ramdisk_start" command line parameter, which controls starting block number of initrd
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
This is preparation for initrd removal
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/admin-guide/blockdev/ramdisk.rst | 3 +--
Documentation/admin-guide/kernel-parameters.txt | 2 --
init/do_mounts_rd.c | 7 -------
3 files changed, 1 insertion(+), 11 deletions(-)
diff --git a/Documentation/admin-guide/blockdev/ramdisk.rst b/Documentation/admin-guide/blockdev/ramdisk.rst
index 9ce6101e8dd9..e57c61108dbc 100644
--- a/Documentation/admin-guide/blockdev/ramdisk.rst
+++ b/Documentation/admin-guide/blockdev/ramdisk.rst
@@ -74,12 +74,11 @@ arch/x86/boot/Makefile.
Some of the kernel command line boot options that may apply here are::
- ramdisk_start=N
ramdisk_size=M
If you make a boot disk that has LILO, then for the above, you would use::
- append = "ramdisk_start=N ramdisk_size=M"
+ append = "ramdisk_size=M"
4) An Example of Creating a Compressed RAM Disk
-----------------------------------------------
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f940c1184912..07e8878f1e13 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5285,8 +5285,6 @@
ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
See Documentation/admin-guide/blockdev/ramdisk.rst.
- ramdisk_start= [RAM] RAM disk image start address
-
random.trust_cpu=off
[KNL,EARLY] Disable trusting the use of the CPU's
random number generator (if available) to
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 8e0a774a9c6f..864fa88d9f89 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -17,13 +17,6 @@
static struct file *in_file, *out_file;
static loff_t in_pos, out_pos;
-static int __init ramdisk_start_setup(char *str)
-{
- /* will be removed in next commit */
- return 1;
-}
-__setup("ramdisk_start=", ramdisk_start_setup);
-
static int __init crd_load(decompress_fn deco);
/*
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 06/62] arm: init: remove special logic for setting brd.rd_size
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
There is no any reason for having special mechanism
for setting ramdisk size.
Also this allows us to change rd_size variable to static
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
arch/arm/kernel/atags_parse.c | 12 ------------
drivers/block/brd.c | 8 ++++----
include/linux/initrd.h | 3 ---
3 files changed, 4 insertions(+), 19 deletions(-)
diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index a3f0a4f84e04..615d9e83c9b5 100644
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -87,18 +87,6 @@ static int __init parse_tag_videotext(const struct tag *tag)
__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
#endif
-#ifdef CONFIG_BLK_DEV_RAM
-static int __init parse_tag_ramdisk(const struct tag *tag)
-{
- if (tag->u.ramdisk.size)
- rd_size = tag->u.ramdisk.size;
-
- return 0;
-}
-
-__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
-#endif
-
static int __init parse_tag_serialnr(const struct tag *tag)
{
system_serial_low = tag->u.serialnr.low;
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 0c2eabe14af3..72f02d2b8a99 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -27,6 +27,10 @@
#include <linux/uaccess.h>
+static unsigned long rd_size = CONFIG_BLK_DEV_RAM_SIZE;
+module_param(rd_size, ulong, 0444);
+MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes.");
+
/*
* Each block ramdisk device has a xarray brd_pages of pages that stores
* the pages containing the block device's contents.
@@ -209,10 +213,6 @@ static int rd_nr = CONFIG_BLK_DEV_RAM_COUNT;
module_param(rd_nr, int, 0444);
MODULE_PARM_DESC(rd_nr, "Maximum number of brd devices");
-unsigned long rd_size = CONFIG_BLK_DEV_RAM_SIZE;
-module_param(rd_size, ulong, 0444);
-MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes.");
-
static int max_part = 1;
module_param(max_part, int, 0444);
MODULE_PARM_DESC(max_part, "Num Minors to reserve between devices");
diff --git a/include/linux/initrd.h b/include/linux/initrd.h
index 6320a9cb6686..b42235c21444 100644
--- a/include/linux/initrd.h
+++ b/include/linux/initrd.h
@@ -5,9 +5,6 @@
#define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
-/* size of a single RAM disk */
-extern unsigned long rd_size;
-
/* 1 if it is not an error if initrd_start < memory_start */
extern int initrd_below_start_ok;
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 07/62] arm: init: remove ATAG_RAMDISK
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
Previous commit removed last reference to ATAG_RAMDISK,
so let's remove it
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
arch/arm/Kconfig | 2 +-
arch/arm/include/uapi/asm/setup.h | 10 ----------
arch/arm/kernel/atags_compat.c | 8 --------
3 files changed, 1 insertion(+), 19 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b1f3df39ed40..afc161d76c5f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1479,7 +1479,7 @@ config ARM_ATAG_DTB_COMPAT
depends on ARM_APPENDED_DTB
help
Some old bootloaders can't be updated to a DTB capable one, yet
- they provide ATAGs with memory configuration, the ramdisk address,
+ they provide ATAGs with memory configuration,
the kernel cmdline string, etc. Such information is dynamically
provided by the bootloader and can't always be stored in a static
DTB. To allow a device tree enabled kernel to be used with such
diff --git a/arch/arm/include/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h
index 8e50e034fec7..3a70890ce80f 100644
--- a/arch/arm/include/uapi/asm/setup.h
+++ b/arch/arm/include/uapi/asm/setup.h
@@ -59,15 +59,6 @@ struct tag_videotext {
__u16 video_points;
};
-/* describes how the ramdisk will be used in kernel */
-#define ATAG_RAMDISK 0x54410004
-
-struct tag_ramdisk {
- __u32 flags; /* bit 0 = load, bit 1 = prompt */
- __u32 size; /* decompressed ramdisk size in _kilo_ bytes */
- __u32 start; /* starting block of floppy-based RAM disk image */
-};
-
/* describes where the compressed ramdisk image lives (virtual address) */
/*
* this one accidentally used virtual addresses - as such,
@@ -150,7 +141,6 @@ struct tag {
struct tag_core core;
struct tag_mem32 mem;
struct tag_videotext videotext;
- struct tag_ramdisk ramdisk;
struct tag_initrd initrd;
struct tag_serialnr serialnr;
struct tag_revision revision;
diff --git a/arch/arm/kernel/atags_compat.c b/arch/arm/kernel/atags_compat.c
index 10da11c212cc..b9747061fa97 100644
--- a/arch/arm/kernel/atags_compat.c
+++ b/arch/arm/kernel/atags_compat.c
@@ -122,14 +122,6 @@ static void __init build_tag_list(struct param_struct *params, void *taglist)
tag->u.core.pagesize = params->u1.s.page_size;
tag->u.core.rootdev = params->u1.s.rootdev;
- tag = tag_next(tag);
- tag->hdr.tag = ATAG_RAMDISK;
- tag->hdr.size = tag_size(tag_ramdisk);
- tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
- (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
- tag->u.ramdisk.size = params->u1.s.ramdisk_size;
- tag->u.ramdisk.start = params->u1.s.rd_start;
-
tag = tag_next(tag);
tag->hdr.tag = ATAG_INITRD;
tag->hdr.size = tag_size(tag_initrd);
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 08/62] arm: init: remove FLAG_RDLOAD and FLAG_RDPROMPT
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
They are unused since previous commit
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/arch/arm/setup.rst | 4 ++--
arch/arm/kernel/atags_compat.c | 2 --
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/Documentation/arch/arm/setup.rst b/Documentation/arch/arm/setup.rst
index 8e12ef3fb9a7..be77d4b2aac1 100644
--- a/Documentation/arch/arm/setup.rst
+++ b/Documentation/arch/arm/setup.rst
@@ -35,8 +35,8 @@ below:
===== ========================
bit 0 1 = mount root read only
bit 1 unused
- bit 2 0 = load ramdisk
- bit 3 0 = prompt for ramdisk
+ bit 2 unused
+ bit 3 unused
===== ========================
rootdev
diff --git a/arch/arm/kernel/atags_compat.c b/arch/arm/kernel/atags_compat.c
index b9747061fa97..8d04edee3066 100644
--- a/arch/arm/kernel/atags_compat.c
+++ b/arch/arm/kernel/atags_compat.c
@@ -44,8 +44,6 @@ struct param_struct {
unsigned long ramdisk_size; /* 8 */
unsigned long flags; /* 12 */
#define FLAG_READONLY 1
-#define FLAG_RDLOAD 4
-#define FLAG_RDPROMPT 8
unsigned long rootdev; /* 16 */
unsigned long video_num_cols; /* 20 */
unsigned long video_num_rows; /* 24 */
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 09/62] arm: init: document rd_start (in param_struct) as obsolete
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
It is unused now
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/arch/arm/setup.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/arch/arm/setup.rst b/Documentation/arch/arm/setup.rst
index be77d4b2aac1..01257f30d489 100644
--- a/Documentation/arch/arm/setup.rst
+++ b/Documentation/arch/arm/setup.rst
@@ -86,7 +86,7 @@ below:
initial ramdisk.
rd_start
- Start address in sectors of the ramdisk image on a floppy disk.
+ This is now obsolete, and should not be used.
system_rev
system revision number.
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 10/62] initrd: remove initrd (initial RAM disk) support
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
Initrd was deprecated in 2020.
Initramfs and (non-initial) RAM disks still work.
Both built-in and bootloader-supplied initramfs still work.
Also remove Documentation/admin-guide/initrd.rst . It contains
paragraph about initramfs, but initramfs already covered in
Documentation/filesystems/ramfs-rootfs-initramfs.rst
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/admin-guide/devices.txt | 6 -
Documentation/admin-guide/index.rst | 1 -
Documentation/admin-guide/initrd.rst | 383 ------------------
Documentation/admin-guide/nfs/nfsroot.rst | 4 +-
Documentation/power/swsusp-dmcrypt.rst | 2 +-
fs/init.c | 14 -
include/linux/init_syscalls.h | 1 -
include/linux/initrd.h | 2 -
init/Kconfig | 2 +-
init/Makefile | 1 -
init/do_mounts.c | 6 +-
init/do_mounts.h | 22 -
init/do_mounts_initrd.c | 83 ----
init/do_mounts_rd.c | 318 ---------------
init/initramfs.c | 31 +-
.../ktest/examples/bootconfigs/tracing.bconf | 3 -
16 files changed, 6 insertions(+), 873 deletions(-)
delete mode 100644 Documentation/admin-guide/initrd.rst
delete mode 100644 init/do_mounts_rd.c
diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
index 94c98be1329a..27835389ca49 100644
--- a/Documentation/admin-guide/devices.txt
+++ b/Documentation/admin-guide/devices.txt
@@ -21,12 +21,6 @@
0 = /dev/ram0 First RAM disk
1 = /dev/ram1 Second RAM disk
...
- 250 = /dev/initrd Initial RAM disk
-
- Older kernels had /dev/ramdisk (1, 1) here.
- /dev/initrd refers to a RAM disk which was preloaded
- by the boot loader; newer kernels use /dev/ram0 for
- the initrd.
2 char Pseudo-TTY masters
0 = /dev/ptyp0 First PTY master
diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst
index 259d79fbeb94..b3b2628ea515 100644
--- a/Documentation/admin-guide/index.rst
+++ b/Documentation/admin-guide/index.rst
@@ -51,7 +51,6 @@ Booting the kernel
bootconfig
kernel-parameters
efi-stub
- initrd
Tracking down and identifying problems
diff --git a/Documentation/admin-guide/initrd.rst b/Documentation/admin-guide/initrd.rst
deleted file mode 100644
index 67bbad8806e8..000000000000
--- a/Documentation/admin-guide/initrd.rst
+++ /dev/null
@@ -1,383 +0,0 @@
-Using the initial RAM disk (initrd)
-===================================
-
-Written 1996,2000 by Werner Almesberger <werner.almesberger@epfl.ch> and
-Hans Lermen <lermen@fgan.de>
-
-
-initrd provides the capability to load a RAM disk by the boot loader.
-This RAM disk can then be mounted as the root file system and programs
-can be run from it. Afterwards, a new root file system can be mounted
-from a different device. The previous root (from initrd) is then moved
-to a directory and can be subsequently unmounted.
-
-initrd is mainly designed to allow system startup to occur in two phases,
-where the kernel comes up with a minimum set of compiled-in drivers, and
-where additional modules are loaded from initrd.
-
-This document gives a brief overview of the use of initrd. A more detailed
-discussion of the boot process can be found in [#f1]_.
-
-
-Operation
----------
-
-When using initrd, the system typically boots as follows:
-
- 1) the boot loader loads the kernel and the initial RAM disk
- 2) the kernel converts initrd into a "normal" RAM disk and
- frees the memory used by initrd
- 3) if the root device is not ``/dev/ram0``, the old (deprecated)
- change_root procedure is followed. see the "Obsolete root change
- mechanism" section below.
- 4) root device is mounted. if it is ``/dev/ram0``, the initrd image is
- then mounted as root
- 5) /sbin/init is executed (this can be any valid executable, including
- shell scripts; it is run with uid 0 and can do basically everything
- init can do).
- 6) init mounts the "real" root file system
- 7) init places the root file system at the root directory using the
- pivot_root system call
- 8) init execs the ``/sbin/init`` on the new root filesystem, performing
- the usual boot sequence
- 9) the initrd file system is removed
-
-Note that changing the root directory does not involve unmounting it.
-It is therefore possible to leave processes running on initrd during that
-procedure. Also note that file systems mounted under initrd continue to
-be accessible.
-
-
-Boot command-line options
--------------------------
-
-initrd adds the following new options::
-
- initrd=<path> (e.g. LOADLIN)
-
- Loads the specified file as the initial RAM disk. When using LILO, you
- have to specify the RAM disk image file in /etc/lilo.conf, using the
- INITRD configuration variable.
-
- noinitrd
-
- initrd data is preserved but it is not converted to a RAM disk and
- the "normal" root file system is mounted. initrd data can be read
- from /dev/initrd. Note that the data in initrd can have any structure
- in this case and doesn't necessarily have to be a file system image.
- This option is used mainly for debugging.
-
- Note: /dev/initrd is read-only and it can only be used once. As soon
- as the last process has closed it, all data is freed and /dev/initrd
- can't be opened anymore.
-
- root=/dev/ram0
-
- initrd is mounted as root, and the normal boot procedure is followed,
- with the RAM disk mounted as root.
-
-Compressed cpio images
-----------------------
-
-Recent kernels have support for populating a ramdisk from a compressed cpio
-archive. On such systems, the creation of a ramdisk image doesn't need to
-involve special block devices or loopbacks; you merely create a directory on
-disk with the desired initrd content, cd to that directory, and run (as an
-example)::
-
- find . | cpio --quiet -H newc -o | gzip -9 -n > /boot/imagefile.img
-
-Examining the contents of an existing image file is just as simple::
-
- mkdir /tmp/imagefile
- cd /tmp/imagefile
- gzip -cd /boot/imagefile.img | cpio -imd --quiet
-
-Installation
-------------
-
-First, a directory for the initrd file system has to be created on the
-"normal" root file system, e.g.::
-
- # mkdir /initrd
-
-The name is not relevant. More details can be found on the
-:manpage:`pivot_root(2)` man page.
-
-If the root file system is created during the boot procedure (i.e. if
-you're building an install floppy), the root file system creation
-procedure should create the ``/initrd`` directory.
-
-If initrd will not be mounted in some cases, its content is still
-accessible if the following device has been created::
-
- # mknod /dev/initrd b 1 250
- # chmod 400 /dev/initrd
-
-Second, the kernel has to be compiled with RAM disk support and with
-support for the initial RAM disk enabled. Also, at least all components
-needed to execute programs from initrd (e.g. executable format and file
-system) must be compiled into the kernel.
-
-Third, you have to create the RAM disk image. This is done by creating a
-file system on a block device, copying files to it as needed, and then
-copying the content of the block device to the initrd file. With recent
-kernels, at least three types of devices are suitable for that:
-
- - a floppy disk (works everywhere but it's painfully slow)
- - a RAM disk (fast, but allocates physical memory)
- - a loopback device (the most elegant solution)
-
-We'll describe the loopback device method:
-
- 1) make sure loopback block devices are configured into the kernel
- 2) create an empty file system of the appropriate size, e.g.::
-
- # dd if=/dev/zero of=initrd bs=300k count=1
- # mke2fs -F -m0 initrd
-
- (if space is critical, you may want to use the Minix FS instead of Ext2)
- 3) mount the file system, e.g.::
-
- # mount -t ext2 -o loop initrd /mnt
-
- 4) create the console device::
-
- # mkdir /mnt/dev
- # mknod /mnt/dev/console c 5 1
-
- 5) copy all the files that are needed to properly use the initrd
- environment. Don't forget the most important file, ``/sbin/init``
-
- .. note:: ``/sbin/init`` permissions must include "x" (execute).
-
- 6) correct operation the initrd environment can frequently be tested
- even without rebooting with the command::
-
- # chroot /mnt /sbin/init
-
- This is of course limited to initrds that do not interfere with the
- general system state (e.g. by reconfiguring network interfaces,
- overwriting mounted devices, trying to start already running demons,
- etc. Note however that it is usually possible to use pivot_root in
- such a chroot'ed initrd environment.)
- 7) unmount the file system::
-
- # umount /mnt
-
- 8) the initrd is now in the file "initrd". Optionally, it can now be
- compressed::
-
- # gzip -9 initrd
-
-For experimenting with initrd, you may want to take a rescue floppy and
-only add a symbolic link from ``/sbin/init`` to ``/bin/sh``. Alternatively, you
-can try the experimental newlib environment [#f2]_ to create a small
-initrd.
-
-Finally, you have to boot the kernel and load initrd. Almost all Linux
-boot loaders support initrd. Since the boot process is still compatible
-with an older mechanism, the following boot command line parameters
-have to be given::
-
- root=/dev/ram0 rw
-
-(rw is only necessary if writing to the initrd file system.)
-
-With LOADLIN, you simply execute::
-
- LOADLIN <kernel> initrd=<disk_image>
-
-e.g.::
-
- LOADLIN C:\LINUX\BZIMAGE initrd=C:\LINUX\INITRD.GZ root=/dev/ram0 rw
-
-With LILO, you add the option ``INITRD=<path>`` to either the global section
-or to the section of the respective kernel in ``/etc/lilo.conf``, and pass
-the options using APPEND, e.g.::
-
- image = /bzImage
- initrd = /boot/initrd.gz
- append = "root=/dev/ram0 rw"
-
-and run ``/sbin/lilo``
-
-For other boot loaders, please refer to the respective documentation.
-
-Now you can boot and enjoy using initrd.
-
-
-Changing the root device
-------------------------
-
-When finished with its duties, init typically changes the root device
-and proceeds with starting the Linux system on the "real" root device.
-
-The procedure involves the following steps:
- - mounting the new root file system
- - turning it into the root file system
- - removing all accesses to the old (initrd) root file system
- - unmounting the initrd file system and de-allocating the RAM disk
-
-Mounting the new root file system is easy: it just needs to be mounted on
-a directory under the current root. Example::
-
- # mkdir /new-root
- # mount -o ro /dev/hda1 /new-root
-
-The root change is accomplished with the pivot_root system call, which
-is also available via the ``pivot_root`` utility (see :manpage:`pivot_root(8)`
-man page; ``pivot_root`` is distributed with util-linux version 2.10h or higher
-[#f3]_). ``pivot_root`` moves the current root to a directory under the new
-root, and puts the new root at its place. The directory for the old root
-must exist before calling ``pivot_root``. Example::
-
- # cd /new-root
- # mkdir initrd
- # pivot_root . initrd
-
-Now, the init process may still access the old root via its
-executable, shared libraries, standard input/output/error, and its
-current root directory. All these references are dropped by the
-following command::
-
- # exec chroot . what-follows <dev/console >dev/console 2>&1
-
-Where what-follows is a program under the new root, e.g. ``/sbin/init``
-If the new root file system will be used with udev and has no valid
-``/dev`` directory, udev must be initialized before invoking chroot in order
-to provide ``/dev/console``.
-
-Note: implementation details of pivot_root may change with time. In order
-to ensure compatibility, the following points should be observed:
-
- - before calling pivot_root, the current directory of the invoking
- process should point to the new root directory
- - use . as the first argument, and the _relative_ path of the directory
- for the old root as the second argument
- - a chroot program must be available under the old and the new root
- - chroot to the new root afterwards
- - use relative paths for dev/console in the exec command
-
-Now, the initrd can be unmounted and the memory allocated by the RAM
-disk can be freed::
-
- # umount /initrd
- # blockdev --flushbufs /dev/ram0
-
-It is also possible to use initrd with an NFS-mounted root, see the
-:manpage:`pivot_root(8)` man page for details.
-
-
-Usage scenarios
----------------
-
-The main motivation for implementing initrd was to allow for modular
-kernel configuration at system installation. The procedure would work
-as follows:
-
- 1) system boots from floppy or other media with a minimal kernel
- (e.g. support for RAM disks, initrd, a.out, and the Ext2 FS) and
- loads initrd
- 2) ``/sbin/init`` determines what is needed to (1) mount the "real" root FS
- (i.e. device type, device drivers, file system) and (2) the
- distribution media (e.g. CD-ROM, network, tape, ...). This can be
- done by asking the user, by auto-probing, or by using a hybrid
- approach.
- 3) ``/sbin/init`` loads the necessary kernel modules
- 4) ``/sbin/init`` creates and populates the root file system (this doesn't
- have to be a very usable system yet)
- 5) ``/sbin/init`` invokes ``pivot_root`` to change the root file system and
- execs - via chroot - a program that continues the installation
- 6) the boot loader is installed
- 7) the boot loader is configured to load an initrd with the set of
- modules that was used to bring up the system (e.g. ``/initrd`` can be
- modified, then unmounted, and finally, the image is written from
- ``/dev/ram0`` or ``/dev/rd/0`` to a file)
- 8) now the system is bootable and additional installation tasks can be
- performed
-
-The key role of initrd here is to re-use the configuration data during
-normal system operation without requiring the use of a bloated "generic"
-kernel or re-compiling or re-linking the kernel.
-
-A second scenario is for installations where Linux runs on systems with
-different hardware configurations in a single administrative domain. In
-such cases, it is desirable to generate only a small set of kernels
-(ideally only one) and to keep the system-specific part of configuration
-information as small as possible. In this case, a common initrd could be
-generated with all the necessary modules. Then, only ``/sbin/init`` or a file
-read by it would have to be different.
-
-A third scenario is more convenient recovery disks, because information
-like the location of the root FS partition doesn't have to be provided at
-boot time, but the system loaded from initrd can invoke a user-friendly
-dialog and it can also perform some sanity checks (or even some form of
-auto-detection).
-
-Last not least, CD-ROM distributors may use it for better installation
-from CD, e.g. by using a boot floppy and bootstrapping a bigger RAM disk
-via initrd from CD; or by booting via a loader like ``LOADLIN`` or directly
-from the CD-ROM, and loading the RAM disk from CD without need of
-floppies.
-
-
-Obsolete root change mechanism
-------------------------------
-
-The following mechanism was used before the introduction of pivot_root.
-Current kernels still support it, but you should _not_ rely on its
-continued availability.
-
-It works by mounting the "real" root device (i.e. the one set with rdev
-in the kernel image or with root=... at the boot command line) as the
-root file system when linuxrc exits. The initrd file system is then
-unmounted, or, if it is still busy, moved to a directory ``/initrd``, if
-such a directory exists on the new root file system.
-
-In order to use this mechanism, you do not have to specify the boot
-command options root, init, or rw. (If specified, they will affect
-the real root file system, not the initrd environment.)
-
-If /proc is mounted, the "real" root device can be changed from within
-linuxrc by writing the number of the new root FS device to the special
-file /proc/sys/kernel/real-root-dev, e.g.::
-
- # echo 0x301 >/proc/sys/kernel/real-root-dev
-
-Note that the mechanism is incompatible with NFS and similar file
-systems.
-
-This old, deprecated mechanism is commonly called ``change_root``, while
-the new, supported mechanism is called ``pivot_root``.
-
-
-Mixed change_root and pivot_root mechanism
-------------------------------------------
-
-In case you did not want to use ``root=/dev/ram0`` to trigger the pivot_root
-mechanism, you may create both ``/linuxrc`` and ``/sbin/init`` in your initrd
-image.
-
-``/linuxrc`` would contain only the following::
-
- #! /bin/sh
- mount -n -t proc proc /proc
- echo 0x0100 >/proc/sys/kernel/real-root-dev
- umount -n /proc
-
-Once linuxrc exited, the kernel would mount again your initrd as root,
-this time executing ``/sbin/init``. Again, it would be the duty of this init
-to build the right environment (maybe using the ``root= device`` passed on
-the cmdline) before the final execution of the real ``/sbin/init``.
-
-
-Resources
----------
-
-.. [#f1] Almesberger, Werner; "Booting Linux: The History and the Future"
- https://www.almesberger.net/cv/papers/ols2k-9.ps.gz
-.. [#f2] newlib package (experimental), with initrd example
- https://www.sourceware.org/newlib/
-.. [#f3] util-linux: Miscellaneous utilities for Linux
- https://www.kernel.org/pub/linux/utils/util-linux/
diff --git a/Documentation/admin-guide/nfs/nfsroot.rst b/Documentation/admin-guide/nfs/nfsroot.rst
index 135218f33394..60452bdfd454 100644
--- a/Documentation/admin-guide/nfs/nfsroot.rst
+++ b/Documentation/admin-guide/nfs/nfsroot.rst
@@ -18,8 +18,8 @@ Mounting the root filesystem via NFS (nfsroot)
In order to use a diskless system, such as an X-terminal or printer server for
example, it is necessary for the root filesystem to be present on a non-disk
device. This may be an initramfs (see
-Documentation/filesystems/ramfs-rootfs-initramfs.rst), a ramdisk (see
-Documentation/admin-guide/initrd.rst) or a filesystem mounted via NFS. The
+Documentation/filesystems/ramfs-rootfs-initramfs.rst)
+or a filesystem mounted via NFS. The
following text describes on how to use NFS for the root filesystem. For the rest
of this text 'client' means the diskless system, and 'server' means the NFS
server.
diff --git a/Documentation/power/swsusp-dmcrypt.rst b/Documentation/power/swsusp-dmcrypt.rst
index 426df59172cd..afb29a58fdf8 100644
--- a/Documentation/power/swsusp-dmcrypt.rst
+++ b/Documentation/power/swsusp-dmcrypt.rst
@@ -10,7 +10,7 @@ Some prerequisites:
You know how dm-crypt works. If not, visit the following web page:
http://www.saout.de/misc/dm-crypt/
You have read Documentation/power/swsusp.rst and understand it.
-You did read Documentation/admin-guide/initrd.rst and know how an initrd works.
+You did read Documentation/filesystems/ramfs-rootfs-initramfs.rst and know how an initrd works.
You know how to create or how to modify an initrd.
Now your system is properly set up, your disk is encrypted except for
diff --git a/fs/init.c b/fs/init.c
index eef5124885e3..dfa50474647c 100644
--- a/fs/init.c
+++ b/fs/init.c
@@ -27,20 +27,6 @@ int __init init_mount(const char *dev_name, const char *dir_name,
return ret;
}
-int __init init_umount(const char *name, int flags)
-{
- int lookup_flags = LOOKUP_MOUNTPOINT;
- struct path path;
- int ret;
-
- if (!(flags & UMOUNT_NOFOLLOW))
- lookup_flags |= LOOKUP_FOLLOW;
- ret = kern_path(name, lookup_flags, &path);
- if (ret)
- return ret;
- return path_umount(&path, flags);
-}
-
int __init init_chdir(const char *filename)
{
struct path path;
diff --git a/include/linux/init_syscalls.h b/include/linux/init_syscalls.h
index 92045d18cbfc..0bdbc458a881 100644
--- a/include/linux/init_syscalls.h
+++ b/include/linux/init_syscalls.h
@@ -2,7 +2,6 @@
int __init init_mount(const char *dev_name, const char *dir_name,
const char *type_page, unsigned long flags, void *data_page);
-int __init init_umount(const char *name, int flags);
int __init init_chdir(const char *filename);
int __init init_chroot(const char *filename);
int __init init_chown(const char *filename, uid_t user, gid_t group, int flags);
diff --git a/include/linux/initrd.h b/include/linux/initrd.h
index b42235c21444..cc389ef1a738 100644
--- a/include/linux/initrd.h
+++ b/include/linux/initrd.h
@@ -3,8 +3,6 @@
#ifndef __LINUX_INITRD_H
#define __LINUX_INITRD_H
-#define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
-
/* 1 if it is not an error if initrd_start < memory_start */
extern int initrd_below_start_ok;
diff --git a/init/Kconfig b/init/Kconfig
index e3eb63eadc87..0263c08960bc 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1441,7 +1441,7 @@ config BLK_DEV_INITRD
boot loader (loadlin or lilo) and that is mounted as root
before the normal boot procedure. It is typically used to
load modules needed to mount the "real" root file system,
- etc. See <file:Documentation/admin-guide/initrd.rst> for details.
+ etc. See <file:Documentation/filesystems/ramfs-rootfs-initramfs.rst> for details.
If RAM disk support (BLK_DEV_RAM) is also included, this
also enables initial RAM disk (initrd) support and adds
diff --git a/init/Makefile b/init/Makefile
index d6f75d8907e0..b020154b3d2a 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -17,7 +17,6 @@ obj-$(CONFIG_INITRAMFS_TEST) += initramfs_test.o
obj-y += init_task.o
mounts-y := do_mounts.o
-mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
#
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 0f2f44e6250c..f0b1a83dbda4 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -452,7 +452,7 @@ static dev_t __init parse_root_device(char *root_device_name)
}
/*
- * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
+ * Prepare the namespace - decide what/where to mount, etc.
*/
void __init prepare_namespace(void)
{
@@ -476,13 +476,9 @@ void __init prepare_namespace(void)
if (saved_root_name[0])
ROOT_DEV = parse_root_device(saved_root_name);
- if (initrd_load(saved_root_name))
- goto out;
-
if (root_wait)
wait_for_root(saved_root_name);
mount_root(saved_root_name);
-out:
devtmpfs_mount();
init_mount(".", "/", NULL, MS_MOVE, NULL);
init_chroot(".");
diff --git a/init/do_mounts.h b/init/do_mounts.h
index 6069ea3eb80d..6c7a535e71ce 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -22,28 +22,6 @@ static inline __init int create_dev(char *name, dev_t dev)
return init_mknod(name, S_IFBLK | 0600, new_encode_dev(dev));
}
-#ifdef CONFIG_BLK_DEV_RAM
-
-int __init rd_load_disk(int n);
-int __init rd_load_image(char *from);
-
-#else
-
-static inline int rd_load_disk(int n) { return 0; }
-static inline int rd_load_image(char *from) { return 0; }
-
-#endif
-
-#ifdef CONFIG_BLK_DEV_INITRD
-bool __init initrd_load(char *root_device_name);
-#else
-static inline bool initrd_load(char *root_device_name)
-{
- return false;
- }
-
-#endif
-
/* Ensure that async file closing finished to prevent spurious errors. */
static inline void init_flush_fput(void)
{
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index f6867bad0d78..308744254c08 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -69,86 +69,3 @@ static int __init early_initrd(char *p)
return early_initrdmem(p);
}
early_param("initrd", early_initrd);
-
-static int __init init_linuxrc(struct subprocess_info *info, struct cred *new)
-{
- ksys_unshare(CLONE_FS | CLONE_FILES);
- console_on_rootfs();
- /* move initrd over / and chdir/chroot in initrd root */
- init_chdir("/root");
- init_mount(".", "/", NULL, MS_MOVE, NULL);
- init_chroot(".");
- ksys_setsid();
- return 0;
-}
-
-static void __init handle_initrd(char *root_device_name)
-{
- struct subprocess_info *info;
- static char *argv[] = { "linuxrc", NULL, };
- extern char *envp_init[];
- int error;
-
- pr_warn("using deprecated initrd support, will be removed soon.\n");
-
- real_root_dev = new_encode_dev(ROOT_DEV);
- create_dev("/dev/root.old", Root_RAM0);
- /* mount initrd on rootfs' /root */
- mount_root_generic("/dev/root.old", root_device_name,
- root_mountflags & ~MS_RDONLY);
- init_mkdir("/old", 0700);
- init_chdir("/old");
-
- info = call_usermodehelper_setup("/linuxrc", argv, envp_init,
- GFP_KERNEL, init_linuxrc, NULL, NULL);
- if (!info)
- return;
- call_usermodehelper_exec(info, UMH_WAIT_PROC|UMH_FREEZABLE);
-
- /* move initrd to rootfs' /old */
- init_mount("..", ".", NULL, MS_MOVE, NULL);
- /* switch root and cwd back to / of rootfs */
- init_chroot("..");
-
- if (new_decode_dev(real_root_dev) == Root_RAM0) {
- init_chdir("/old");
- return;
- }
-
- init_chdir("/");
- ROOT_DEV = new_decode_dev(real_root_dev);
- mount_root(root_device_name);
-
- printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
- error = init_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
- if (!error)
- printk("okay\n");
- else {
- if (error == -ENOENT)
- printk("/initrd does not exist. Ignored.\n");
- else
- printk("failed\n");
- printk(KERN_NOTICE "Unmounting old root\n");
- init_umount("/old", MNT_DETACH);
- }
-}
-
-bool __init initrd_load(char *root_device_name)
-{
- if (mount_initrd) {
- create_dev("/dev/ram", Root_RAM0);
- /*
- * Load the initrd data into /dev/ram0. Execute it as initrd
- * unless /dev/ram0 is supposed to be our actual root device,
- * in that case the ram disk is just set up here, and gets
- * mounted in the normal path.
- */
- if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
- init_unlink("/initrd.image");
- handle_initrd(root_device_name);
- return true;
- }
- }
- init_unlink("/initrd.image");
- return false;
-}
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
deleted file mode 100644
index 864fa88d9f89..000000000000
--- a/init/do_mounts_rd.c
+++ /dev/null
@@ -1,318 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/minix_fs.h>
-#include <linux/ext2_fs.h>
-#include <linux/romfs_fs.h>
-#include <uapi/linux/cramfs_fs.h>
-#include <linux/initrd.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-
-#include "do_mounts.h"
-#include "../fs/squashfs/squashfs_fs.h"
-
-#include <linux/decompress/generic.h>
-
-static struct file *in_file, *out_file;
-static loff_t in_pos, out_pos;
-
-static int __init crd_load(decompress_fn deco);
-
-/*
- * This routine tries to find a RAM disk image to load, and returns the
- * number of blocks to read for a non-compressed image, 0 if the image
- * is a compressed image, and -1 if an image with the right magic
- * numbers could not be found.
- *
- * We currently check for the following magic numbers:
- * minix
- * ext2
- * romfs
- * cramfs
- * squashfs
- * gzip
- * bzip2
- * lzma
- * xz
- * lzo
- * lz4
- */
-static int __init
-identify_ramdisk_image(struct file *file, loff_t pos,
- decompress_fn *decompressor)
-{
- const int size = 512;
- struct minix_super_block *minixsb;
- struct romfs_super_block *romfsb;
- struct cramfs_super *cramfsb;
- struct squashfs_super_block *squashfsb;
- int nblocks = -1;
- unsigned char *buf;
- const char *compress_name;
- unsigned long n;
- int start_block = 0;
-
- buf = kmalloc(size, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- minixsb = (struct minix_super_block *) buf;
- romfsb = (struct romfs_super_block *) buf;
- cramfsb = (struct cramfs_super *) buf;
- squashfsb = (struct squashfs_super_block *) buf;
- memset(buf, 0xe5, size);
-
- /*
- * Read block 0 to test for compressed kernel
- */
- pos = start_block * BLOCK_SIZE;
- kernel_read(file, buf, size, &pos);
-
- *decompressor = decompress_method(buf, size, &compress_name);
- if (compress_name) {
- printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
- compress_name, start_block);
- if (!*decompressor)
- printk(KERN_EMERG
- "RAMDISK: %s decompressor not configured!\n",
- compress_name);
- nblocks = 0;
- goto done;
- }
-
- /* romfs is at block zero too */
- if (romfsb->word0 == ROMSB_WORD0 &&
- romfsb->word1 == ROMSB_WORD1) {
- printk(KERN_NOTICE
- "RAMDISK: romfs filesystem found at block %d\n",
- start_block);
- nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
- goto done;
- }
-
- if (cramfsb->magic == CRAMFS_MAGIC) {
- printk(KERN_NOTICE
- "RAMDISK: cramfs filesystem found at block %d\n",
- start_block);
- nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
- goto done;
- }
-
- /* squashfs is at block zero too */
- if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
- printk(KERN_NOTICE
- "RAMDISK: squashfs filesystem found at block %d\n",
- start_block);
- nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
- >> BLOCK_SIZE_BITS;
- goto done;
- }
-
- /*
- * Read 512 bytes further to check if cramfs is padded
- */
- pos = start_block * BLOCK_SIZE + 0x200;
- kernel_read(file, buf, size, &pos);
-
- if (cramfsb->magic == CRAMFS_MAGIC) {
- printk(KERN_NOTICE
- "RAMDISK: cramfs filesystem found at block %d\n",
- start_block);
- nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
- goto done;
- }
-
- /*
- * Read block 1 to test for minix and ext2 superblock
- */
- pos = (start_block + 1) * BLOCK_SIZE;
- kernel_read(file, buf, size, &pos);
-
- /* Try minix */
- if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
- minixsb->s_magic == MINIX_SUPER_MAGIC2) {
- printk(KERN_NOTICE
- "RAMDISK: Minix filesystem found at block %d\n",
- start_block);
- nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
- goto done;
- }
-
- /* Try ext2 */
- n = ext2_image_size(buf);
- if (n) {
- printk(KERN_NOTICE
- "RAMDISK: ext2 filesystem found at block %d\n",
- start_block);
- nblocks = n;
- goto done;
- }
-
- printk(KERN_NOTICE
- "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
- start_block);
-
-done:
- kfree(buf);
- return nblocks;
-}
-
-static unsigned long nr_blocks(struct file *file)
-{
- struct inode *inode = file->f_mapping->host;
-
- if (!S_ISBLK(inode->i_mode))
- return 0;
- return i_size_read(inode) >> 10;
-}
-
-int __init rd_load_image(char *from)
-{
- int res = 0;
- unsigned long rd_blocks, devblocks;
- int nblocks, i;
- char *buf = NULL;
- unsigned short rotate = 0;
- decompress_fn decompressor = NULL;
-#if !defined(CONFIG_S390)
- char rotator[4] = { '|' , '/' , '-' , '\\' };
-#endif
-
- out_file = filp_open("/dev/ram", O_RDWR, 0);
- if (IS_ERR(out_file))
- goto out;
-
- in_file = filp_open(from, O_RDONLY, 0);
- if (IS_ERR(in_file))
- goto noclose_input;
-
- in_pos = 0;
- nblocks = identify_ramdisk_image(in_file, in_pos, &decompressor);
- if (nblocks < 0)
- goto done;
-
- if (nblocks == 0) {
- if (crd_load(decompressor) == 0)
- goto successful_load;
- goto done;
- }
-
- /*
- * NOTE NOTE: nblocks is not actually blocks but
- * the number of kibibytes of data to load into a ramdisk.
- */
- rd_blocks = nr_blocks(out_file);
- if (nblocks > rd_blocks) {
- printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
- nblocks, rd_blocks);
- goto done;
- }
-
- /*
- * OK, time to copy in the data
- */
- if (strcmp(from, "/initrd.image") == 0)
- devblocks = nblocks;
- else
- devblocks = nr_blocks(in_file);
-
- if (devblocks == 0) {
- printk(KERN_ERR "RAMDISK: could not determine device size\n");
- goto done;
- }
-
- buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
- if (!buf) {
- printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
- goto done;
- }
-
- printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
- nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
- for (i = 0; i < nblocks; i++) {
- if (i && (i % devblocks == 0)) {
- pr_cont("done disk #1.\n");
- rotate = 0;
- fput(in_file);
- break;
- }
- kernel_read(in_file, buf, BLOCK_SIZE, &in_pos);
- kernel_write(out_file, buf, BLOCK_SIZE, &out_pos);
-#if !defined(CONFIG_S390)
- if (!(i % 16)) {
- pr_cont("%c\b", rotator[rotate & 0x3]);
- rotate++;
- }
-#endif
- }
- pr_cont("done.\n");
-
-successful_load:
- res = 1;
-done:
- fput(in_file);
-noclose_input:
- fput(out_file);
-out:
- kfree(buf);
- init_unlink("/dev/ram");
- return res;
-}
-
-int __init rd_load_disk(int n)
-{
- create_dev("/dev/root", ROOT_DEV);
- create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
- return rd_load_image("/dev/root");
-}
-
-static int exit_code;
-static int decompress_error;
-
-static long __init compr_fill(void *buf, unsigned long len)
-{
- long r = kernel_read(in_file, buf, len, &in_pos);
- if (r < 0)
- printk(KERN_ERR "RAMDISK: error while reading compressed data");
- else if (r == 0)
- printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
- return r;
-}
-
-static long __init compr_flush(void *window, unsigned long outcnt)
-{
- long written = kernel_write(out_file, window, outcnt, &out_pos);
- if (written != outcnt) {
- if (decompress_error == 0)
- printk(KERN_ERR
- "RAMDISK: incomplete write (%ld != %ld)\n",
- written, outcnt);
- decompress_error = 1;
- return -1;
- }
- return outcnt;
-}
-
-static void __init error(char *x)
-{
- printk(KERN_ERR "%s\n", x);
- exit_code = 1;
- decompress_error = 1;
-}
-
-static int __init crd_load(decompress_fn deco)
-{
- int result;
-
- if (!deco) {
- pr_emerg("Invalid ramdisk decompression routine. "
- "Select appropriate config option.\n");
- panic("Could not decompress initial ramdisk image.");
- }
-
- result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
- if (decompress_error)
- result = 1;
- return result;
-}
diff --git a/init/initramfs.c b/init/initramfs.c
index 097673b97784..850cb0de873e 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -692,28 +692,6 @@ static inline bool kexec_free_initrd(void)
}
#endif /* CONFIG_KEXEC_CORE */
-#ifdef CONFIG_BLK_DEV_RAM
-static void __init populate_initrd_image(char *err)
-{
- ssize_t written;
- struct file *file;
- loff_t pos = 0;
-
- printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n",
- err);
- file = filp_open("/initrd.image", O_WRONLY|O_CREAT|O_LARGEFILE, 0700);
- if (IS_ERR(file))
- return;
-
- written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start,
- &pos);
- if (written != initrd_end - initrd_start)
- pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
- written, initrd_end - initrd_start);
- fput(file);
-}
-#endif /* CONFIG_BLK_DEV_RAM */
-
static void __init do_populate_rootfs(void *unused, async_cookie_t cookie)
{
/* Load the built in initramfs */
@@ -724,18 +702,11 @@ static void __init do_populate_rootfs(void *unused, async_cookie_t cookie)
if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE))
goto done;
- if (IS_ENABLED(CONFIG_BLK_DEV_RAM))
- printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
- else
- printk(KERN_INFO "Unpacking initramfs...\n");
+ printk(KERN_INFO "Unpacking initramfs...\n");
err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
if (err) {
-#ifdef CONFIG_BLK_DEV_RAM
- populate_initrd_image(err);
-#else
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
-#endif
}
done:
diff --git a/tools/testing/ktest/examples/bootconfigs/tracing.bconf b/tools/testing/ktest/examples/bootconfigs/tracing.bconf
index bf117c78115a..c81ee5e30d2d 100644
--- a/tools/testing/ktest/examples/bootconfigs/tracing.bconf
+++ b/tools/testing/ktest/examples/bootconfigs/tracing.bconf
@@ -16,9 +16,6 @@ ftrace {
myevent2 {
probes = "vfs_write $arg2 +0($arg2):ustring $arg3";
}
- myevent3 {
- probes = "initrd_load";
- }
enable
}
}
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 11/62] init, efi: remove "noinitrd" command line parameter
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
It was inconsistent before initrd removal: it mostly
controlled initrd only, but in EFI stub boot mode
it controlled both initrd and initramfs
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/admin-guide/kernel-parameters.txt | 3 ---
arch/arm/configs/collie_defconfig | 2 +-
arch/arm/configs/imx_v6_v7_defconfig | 2 +-
arch/arm/configs/neponset_defconfig | 2 +-
arch/arm/configs/spitz_defconfig | 2 +-
drivers/firmware/efi/libstub/efi-stub-helper.c | 5 +----
init/do_mounts_initrd.c | 9 ---------
7 files changed, 5 insertions(+), 20 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 07e8878f1e13..ad52e3d26014 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4271,9 +4271,6 @@
Note that this argument takes precedence over
the CONFIG_RCU_NOCB_CPU_DEFAULT_ALL option.
- noinitrd [RAM] Tells the kernel not to load any configured
- initial RAM disk.
-
nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
remapping.
[Deprecated - use intremap=off]
diff --git a/arch/arm/configs/collie_defconfig b/arch/arm/configs/collie_defconfig
index 578c6a4af620..00dc8ae22824 100644
--- a/arch/arm/configs/collie_defconfig
+++ b/arch/arm/configs/collie_defconfig
@@ -9,7 +9,7 @@ CONFIG_ARCH_MULTI_V4=y
# CONFIG_ARCH_MULTI_V7 is not set
CONFIG_ARCH_SA1100=y
CONFIG_SA1100_COLLIE=y
-CONFIG_CMDLINE="noinitrd root=/dev/mtdblock2 rootfstype=jffs2 fbcon=rotate:1"
+CONFIG_CMDLINE="root=/dev/mtdblock2 rootfstype=jffs2 fbcon=rotate:1"
CONFIG_FPE_NWFPE=y
CONFIG_PM=y
# CONFIG_SWAP is not set
diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index 9a57763a8d38..b53ae2c052fc 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig
@@ -32,7 +32,7 @@ CONFIG_SMP=y
CONFIG_ARM_PSCI=y
CONFIG_HIGHMEM=y
CONFIG_ARCH_FORCE_MAX_ORDER=13
-CONFIG_CMDLINE="noinitrd console=ttymxc0,115200"
+CONFIG_CMDLINE="console=ttymxc0,115200"
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig
index 4d720001c12e..a61eb27373a8 100644
--- a/arch/arm/configs/neponset_defconfig
+++ b/arch/arm/configs/neponset_defconfig
@@ -9,7 +9,7 @@ CONFIG_ASSABET_NEPONSET=y
CONFIG_ZBOOT_ROM_TEXT=0x80000
CONFIG_ZBOOT_ROM_BSS=0xc1000000
CONFIG_ZBOOT_ROM=y
-CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) mem=32M noinitrd initrd=0xc0800000,3M"
+CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) mem=32M initrd=0xc0800000,3M"
CONFIG_FPE_NWFPE=y
CONFIG_PM=y
CONFIG_MODULES=y
diff --git a/arch/arm/configs/spitz_defconfig b/arch/arm/configs/spitz_defconfig
index ac2a0f998c73..8582b6f2cf9d 100644
--- a/arch/arm/configs/spitz_defconfig
+++ b/arch/arm/configs/spitz_defconfig
@@ -10,7 +10,7 @@ CONFIG_ARCH_PXA=y
CONFIG_PXA_SHARPSL=y
CONFIG_MACH_AKITA=y
CONFIG_MACH_BORZOI=y
-CONFIG_CMDLINE="console=ttyS0,115200n8 console=tty1 noinitrd root=/dev/mtdblock2 rootfstype=jffs2 debug"
+CONFIG_CMDLINE="console=ttyS0,115200n8 console=tty1 root=/dev/mtdblock2 rootfstype=jffs2 debug"
CONFIG_FPE_NWFPE=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 7aa2f9ad2935..6d89bf941d57 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -21,7 +21,6 @@ bool efi_nochunk;
bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
bool efi_novamap;
-static bool efi_noinitrd;
static bool efi_nosoftreserve;
static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA);
@@ -75,8 +74,6 @@ efi_status_t efi_parse_options(char const *cmdline)
efi_nokaslr = true;
} else if (!strcmp(param, "quiet")) {
efi_loglevel = CONSOLE_LOGLEVEL_QUIET;
- } else if (!strcmp(param, "noinitrd")) {
- efi_noinitrd = true;
} else if (IS_ENABLED(CONFIG_X86_64) && !strcmp(param, "no5lvl")) {
efi_no5lvl = true;
} else if (IS_ENABLED(CONFIG_ARCH_HAS_MEM_ENCRYPT) &&
@@ -614,7 +611,7 @@ efi_status_t efi_load_initrd(efi_loaded_image_t *image,
efi_status_t status = EFI_SUCCESS;
struct linux_efi_initrd initrd, *tbl;
- if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || efi_noinitrd)
+ if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
return EFI_SUCCESS;
status = efi_load_initrd_dev_path(&initrd, hard_limit);
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 308744254c08..bec1c5d684a3 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -15,7 +15,6 @@
unsigned long initrd_start, initrd_end;
int initrd_below_start_ok;
static unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
-static int __initdata mount_initrd = 1;
phys_addr_t phys_initrd_start __initdata;
unsigned long phys_initrd_size __initdata;
@@ -39,14 +38,6 @@ static __init int kernel_do_mounts_initrd_sysctls_init(void)
late_initcall(kernel_do_mounts_initrd_sysctls_init);
#endif /* CONFIG_SYSCTL */
-static int __init no_initrd(char *str)
-{
- mount_initrd = 0;
- return 1;
-}
-
-__setup("noinitrd", no_initrd);
-
static int __init early_initrdmem(char *p)
{
phys_addr_t start;
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 12/62] init: remove /proc/sys/kernel/real-root-dev
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
It was used for initrd support, which was removed in previous
commits
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
Documentation/admin-guide/sysctl/kernel.rst | 6 ------
include/uapi/linux/sysctl.h | 1 -
init/do_mounts_initrd.c | 20 --------------------
3 files changed, 27 deletions(-)
diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 8b49eab937d0..cc958c228bc2 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -1215,12 +1215,6 @@ that support this feature.
== ===========================================================================
-real-root-dev
-=============
-
-See Documentation/admin-guide/initrd.rst.
-
-
reboot-cmd (SPARC only)
=======================
diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
index 63d1464cb71c..1c7fe0f4dca4 100644
--- a/include/uapi/linux/sysctl.h
+++ b/include/uapi/linux/sysctl.h
@@ -92,7 +92,6 @@ enum
KERN_DOMAINNAME=8, /* string: domainname */
KERN_PANIC=15, /* int: panic timeout */
- KERN_REALROOTDEV=16, /* real root device to mount after initrd */
KERN_SPARC_REBOOT=21, /* reboot command on Sparc */
KERN_CTLALTDEL=22, /* int: allow ctl-alt-del to reboot */
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index bec1c5d684a3..d5264e9a52e0 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -14,30 +14,10 @@
unsigned long initrd_start, initrd_end;
int initrd_below_start_ok;
-static unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
phys_addr_t phys_initrd_start __initdata;
unsigned long phys_initrd_size __initdata;
-#ifdef CONFIG_SYSCTL
-static const struct ctl_table kern_do_mounts_initrd_table[] = {
- {
- .procname = "real-root-dev",
- .data = &real_root_dev,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
-};
-
-static __init int kernel_do_mounts_initrd_sysctls_init(void)
-{
- register_sysctl_init("kernel", kern_do_mounts_initrd_table);
- return 0;
-}
-late_initcall(kernel_do_mounts_initrd_sysctls_init);
-#endif /* CONFIG_SYSCTL */
-
static int __init early_initrdmem(char *p)
{
phys_addr_t start;
--
2.47.2
^ permalink raw reply related
* [PATCH RESEND 13/62] ext2: remove ext2_image_size and associated code
From: Askar Safin @ 2025-09-13 0:37 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Linus Torvalds, Greg Kroah-Hartman, Christian Brauner, Al Viro,
Jan Kara, Christoph Hellwig, Jens Axboe, Andy Shevchenko,
Aleksa Sarai, Thomas Weißschuh, Julian Stecklina, Gao Xiang,
Art Nikpal, Andrew Morton, Eric Curtin, Alexander Graf,
Rob Landley, Lennart Poettering, linux-arch, linux-alpha,
linux-snps-arc, linux-arm-kernel, linux-csky, linux-hexagon,
loongarch, linux-m68k, linux-mips, linux-openrisc, linux-parisc,
linuxppc-dev, linux-riscv, linux-s390, linux-sh, sparclinux,
linux-um, x86, Ingo Molnar, linux-block, initramfs, linux-api,
linux-doc, linux-efi, linux-ext4, Theodore Y . Ts'o,
linux-acpi, Michal Simek, devicetree, Luis Chamberlain, Kees Cook,
Thorsten Blum, Heiko Carstens, patches
In-Reply-To: <20250913003842.41944-1-safinaskar@gmail.com>
It is not used anymore
Signed-off-by: Askar Safin <safinaskar@gmail.com>
---
fs/ext2/ext2.h | 9 ---------
include/linux/ext2_fs.h | 13 -------------
2 files changed, 22 deletions(-)
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index cf97b76e9fd3..d623a14040d9 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -608,15 +608,6 @@ struct ext2_dir_entry_2 {
~EXT2_DIR_ROUND)
#define EXT2_MAX_REC_LEN ((1<<16)-1)
-static inline void verify_offsets(void)
-{
-#define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
- A(EXT2_SB_MAGIC_OFFSET, s_magic);
- A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count);
- A(EXT2_SB_BSIZE_OFFSET, s_log_block_size);
-#undef A
-}
-
/*
* ext2 mount options
*/
diff --git a/include/linux/ext2_fs.h b/include/linux/ext2_fs.h
index 1fef88569037..e5ebe6cdf06c 100644
--- a/include/linux/ext2_fs.h
+++ b/include/linux/ext2_fs.h
@@ -27,17 +27,4 @@
*/
#define EXT2_LINK_MAX 32000
-#define EXT2_SB_MAGIC_OFFSET 0x38
-#define EXT2_SB_BLOCKS_OFFSET 0x04
-#define EXT2_SB_BSIZE_OFFSET 0x18
-
-static inline u64 ext2_image_size(void *ext2_sb)
-{
- __u8 *p = ext2_sb;
- if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC))
- return 0;
- return (u64)le32_to_cpup((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) <<
- le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET));
-}
-
#endif /* _LINUX_EXT2_FS_H */
--
2.47.2
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