From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f43.google.com (mail-lf1-f43.google.com [209.85.167.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D3DEE2F0C6D for ; Wed, 19 Nov 2025 22:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763591198; cv=none; b=tBAze6/Cs+/uvJQLuZiBiNl7Uynt+IisimDxBgSrn/V3zrFoBy8andkhNQS4W1tU9UGzPCkTR+s+rHIbQjSFtYuqLhIUe5NgZ55ZbkoqaLHg4vrmLBdN9di1EmTT795DzjI+l5wa+UGId18TBYMpUqqXbjMj+YOkDquy8EEx3kM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763591198; c=relaxed/simple; bh=B30ksd/i6KlWZzGSOJluZMvprLijJbryg/ZlhpI37Xg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UUSXBBL4LWcT3emiW/N5VyWKYBIDN2/kwkgsWGJlqynGqh3zgyXDCUvpo1Hyh49DTDXLKhACCntSrEE+afOCMM/8JdfGmIRT3tnKRXfwR02Q0AXbwa/jlAzGfbLj1+TLnIVm9wMs9RA3cgUhPs+MH0GxfdTiMvpK9AOxvnRkZk4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Ks/+oZuJ; arc=none smtp.client-ip=209.85.167.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Ks/+oZuJ" Received: by mail-lf1-f43.google.com with SMTP id 2adb3069b0e04-59431f57bf6so174218e87.3 for ; Wed, 19 Nov 2025 14:26:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763591194; x=1764195994; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=rpz7T6QQ/kKXNjO1wwsOWaO7Nw3DfMsERYzmwHv+rnY=; b=Ks/+oZuJCDnebhI/q84MpZIMxSSmR02wVCEevnZc1aVVu9pDn1WEtDzlaWN4rHlVEK xRTI+4lXSL73O0KE9kgIGE1c0FiCg7u2InWpFSvXguS7hu6KuxzsB2MYGztfV5anG9vG COYW43//eD8Vdu+t4Ft8o4W3DWuvWQ3vrMBroCj3Gj4DP3zbYsJGxzwUHPwvf0aU+OuS G4aMe7Mv92CUhLl/KUHpKuum+hX4ahVMaLmmIk/a04AfZ+IIcQ5bdKqn7BqOfNLHj3Ix mKIfyfMnA42vfid2aXlHPDxr9k9IccE2MzTGL20vfqF4aLub6u8iBT5bDMaNuv1KQ33t R62w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763591194; x=1764195994; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=rpz7T6QQ/kKXNjO1wwsOWaO7Nw3DfMsERYzmwHv+rnY=; b=cSo/uE2yDFkyHLim5Ydt2CQ5jKBOkqGwCfK5KTbJgC8Ot8SJb7bKof1BiDfF9eg30n qsdvOLXezSR8VQfj3sAaZoD6LRXxMwlmg9eMJbv9yUrAGwHTuyezcOpvTCAeoZ7P80vh WOLtPN7ldMaNAMsiiV/4CWqQW75q/6836RKAhUZE+adlObFgioyFkIaDZE+O+1TaDxM3 saELXXvzZd/Y6RJL22+ZZ84mec/M5GjzWaYO3GCn2A5P/UyjKpXXMWSxa3Yf7jTEGAFI H/wl+wFWsrz7NKlECPn+4Up3DglQDTF+VrUCa8zI0jviDAQFxs3PcxKr5UvswCqHqMba TZkA== X-Forwarded-Encrypted: i=1; AJvYcCWV8UGYUz/G+FuhIhM8iPckN4atG0JCl6g7MPlyTSPURm/ER35yOUp8O9DtPAJwAdvt2cLmDEshZYc=@vger.kernel.org X-Gm-Message-State: AOJu0YxsUA08+I7zpia3RGmaYcVm4bk37Qo0Bxrtu9NBFUr+HBMDn0im fR5w46pFQg88XDE4fSOjcvZVqoqPGIROTMO6rKUvD0HjEbeVIfkpJSi+ X-Gm-Gg: ASbGncvSwiRVbZtMbKPJIn+Zu+soIgeY7kRd73ELQ1oasGaxWejc5WOjpX4GZW+usuv ZK10ZG6gI4iakBg+JTAeUVZnoggIGe2Q3/gjGCOKvlzNvg/Bx0F9HgQbPdIveIktlzMyndkkOC1 QiYewybo73LiwUzRSrBbgDBDHP11DPdvVqFMnIf3Gz2bRl5mJ/4YMO0XKtZFUGIOZBSgY1lcn2s ojlL8ZeYaRkK2uuUa7au71kTGCRm6jllfdSoREdrPGiJSmtgCPjBxCjbo1tXjdK1hU8Iv8Fdn7c DtIPuVbY/fPE/vBBuNSqLMZXDmEt740lU3CorVAa7sA5oLVoEqJ4XlWBpqHhx97OJnqtR+gUJ+3 tXZfY/CaiDzR7nbSqOE/yF23JNsDp7CTRSYMQnCo9usFIPSy6h0oevsJLvPBYrVNmdksogccF+r tlF1+8WF7RYuheBwUYxQjR X-Google-Smtp-Source: AGHT+IHKJFkl9t5N8j7PyCRMaEBOUQoDY6WPT5NRD3nx1OIP3SnAvvmsobVsbW3qyUfaDOP5L+EeFQ== X-Received: by 2002:a05:6512:3e0a:b0:590:6598:4edf with SMTP id 2adb3069b0e04-5969e318d8cmr157688e87.47.1763591193750; Wed, 19 Nov 2025 14:26:33 -0800 (PST) Received: from localhost ([109.167.240.218]) by smtp.gmail.com with UTF8SMTPSA id 2adb3069b0e04-5969db8989csm167842e87.39.2025.11.19.14.26.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Nov 2025 14:26:33 -0800 (PST) From: Askar Safin To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Linus Torvalds , Greg Kroah-Hartman , Christian Brauner , Al Viro , Jan Kara , Christoph Hellwig , Jens Axboe , Andy Shevchenko , Aleksa Sarai , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Julian Stecklina , Gao Xiang , Art Nikpal , Andrew Morton , Alexander Graf , Rob Landley , Lennart Poettering , linux-arch@vger.kernel.org, linux-block@vger.kernel.org, initramfs@vger.kernel.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org, Michal Simek , Luis Chamberlain , Kees Cook , Thorsten Blum , Heiko Carstens , Arnd Bergmann , Dave Young , Christophe Leroy , Krzysztof Kozlowski , Borislav Petkov , Jessica Clarke , Nicolas Schichan , David Disseldorp , patches@lists.linux.dev Subject: [PATCH v4 2/3] initrd: remove deprecated code path (linuxrc) Date: Wed, 19 Nov 2025 22:24:06 +0000 Message-ID: <20251119222407.3333257-3-safinaskar@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251119222407.3333257-1-safinaskar@gmail.com> References: <20251119222407.3333257-1-safinaskar@gmail.com> Precedence: bulk X-Mailing-List: linux-api@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Remove linuxrc initrd code path, which was deprecated in 2020. Initramfs and (non-initial) RAM disks (i. e. brd) still work. Both built-in and bootloader-supplied initramfs still work. Non-linuxrc initrd code path (i. e. using /dev/ram as final root filesystem) still works, but I put deprecation message into it. Also I deprecate command line parameters "noinitrd" and "ramdisk_start=". Signed-off-by: Askar Safin --- .../admin-guide/kernel-parameters.txt | 8 +- fs/init.c | 14 --- include/linux/init_syscalls.h | 1 - include/linux/initrd.h | 2 - init/do_mounts.c | 4 +- init/do_mounts.h | 18 +--- init/do_mounts_initrd.c | 87 ++----------------- init/do_mounts_rd.c | 17 +--- 8 files changed, 22 insertions(+), 129 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 15af6933eab4..df441d1a9555 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4324,8 +4324,10 @@ 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. + noinitrd [Deprecated,RAM] Tells the kernel not to load any configured + initial RAM disk. Currently this parameter applies to + initrd only, not to initramfs. But it applies to both + in EFI mode. nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt remapping. @@ -5338,7 +5340,7 @@ ramdisk_size= [RAM] Sizes of RAM disks in kilobytes See Documentation/admin-guide/blockdev/ramdisk.rst. - ramdisk_start= [RAM] RAM disk image start address + ramdisk_start= [Deprecated,RAM] RAM disk image start address random.trust_cpu=off [KNL,EARLY] Disable trusting the use of the CPU's diff --git a/fs/init.c b/fs/init.c index 07f592ccdba8..60719494d9a0 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 f1a1f4c92ded..7e5d26c8136f 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 ... */ - /* starting block # of image */ extern int rd_image_start; diff --git a/init/do_mounts.c b/init/do_mounts.c index 0f2f44e6250c..1054ad3c905a 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -476,13 +476,11 @@ 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; + initrd_load(); 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..a386ee5314c9 100644 --- a/init/do_mounts.h +++ b/init/do_mounts.h @@ -23,25 +23,15 @@ static inline __init int create_dev(char *name, dev_t dev) } #ifdef CONFIG_BLK_DEV_RAM - -int __init rd_load_disk(int n); -int __init rd_load_image(char *from); - +int __init rd_load_image(void); #else - -static inline int rd_load_disk(int n) { return 0; } -static inline int rd_load_image(char *from) { return 0; } - +static inline int rd_load_image(void) { return 0; } #endif #ifdef CONFIG_BLK_DEV_INITRD -bool __init initrd_load(char *root_device_name); +void __init initrd_load(void); #else -static inline bool initrd_load(char *root_device_name) -{ - return false; - } - +static inline void initrd_load(void) { } #endif /* Ensure that async file closing finished to prevent spurious errors. */ diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index f6867bad0d78..fe335dbc95e0 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -2,13 +2,7 @@ #include #include #include -#include -#include #include -#include -#include -#include -#include #include "do_mounts.h" @@ -41,6 +35,7 @@ late_initcall(kernel_do_mounts_initrd_sysctls_init); static int __init no_initrd(char *str) { + pr_warn("noinitrd option is deprecated and will be removed soon\n"); mount_initrd = 0; return 1; } @@ -70,85 +65,19 @@ static int __init early_initrd(char *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) +void __init initrd_load(void) { 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. + * Load the initrd data into /dev/ram0. */ - if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { - init_unlink("/initrd.image"); - handle_initrd(root_device_name); - return true; + if (rd_load_image()) { + pr_warn("using deprecated initrd support, will be removed in January 2027; " + "use initramfs instead or (as a last resort) /sys/firmware/initrd; " + "see section \"Workaround\" in " + "https://lore.kernel.org/lkml/20251010094047.3111495-1-safinaskar@gmail.com\n"); } } init_unlink("/initrd.image"); - return false; } diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c index 5311f2d7edc8..0a021bbcd501 100644 --- a/init/do_mounts_rd.c +++ b/init/do_mounts_rd.c @@ -22,6 +22,7 @@ int __initdata rd_image_start; /* starting block # of image */ static int __init ramdisk_start_setup(char *str) { + pr_warn("ramdisk_start= option is deprecated and will be removed soon\n"); rd_image_start = simple_strtol(str,NULL,0); return 1; } @@ -177,7 +178,7 @@ static unsigned long nr_blocks(struct file *file) return i_size_read(inode) >> 10; } -int __init rd_load_image(char *from) +int __init rd_load_image(void) { int res = 0; unsigned long rd_blocks, devblocks, nr_disks; @@ -191,7 +192,7 @@ int __init rd_load_image(char *from) if (IS_ERR(out_file)) goto out; - in_file = filp_open(from, O_RDONLY, 0); + in_file = filp_open("/initrd.image", O_RDONLY, 0); if (IS_ERR(in_file)) goto noclose_input; @@ -220,10 +221,7 @@ int __init rd_load_image(char *from) /* * OK, time to copy in the data */ - if (strcmp(from, "/initrd.image") == 0) - devblocks = nblocks; - else - devblocks = nr_blocks(in_file); + devblocks = nblocks; if (devblocks == 0) { printk(KERN_ERR "RAMDISK: could not determine device size\n"); @@ -267,13 +265,6 @@ int __init rd_load_image(char *from) 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; -- 2.47.3