[tip: x86/core] x86: Remove toolchain check for X32 ABI capability

tip-bot2 for Masahiro Yamada
2022-03-15T10:43:47Z

The following commit has been merged into the x86/core branch of tip:

Commit-ID: 83a44a4f47ad20997aebb311fc678a13cde391d7
Gitweb: https://git.kernel.org/tip/83a44a4f47ad20997aebb311fc678a13cde391d7
Author: Masahiro Yamada <masahiroy@kernel.org>
AuthorDate: Mon, 14 Mar 2022 12:48:41 -07:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:48 +01:00

x86: Remove toolchain check for X32 ABI capability

Commit 0bf6276392e9 ("x32: Warn and disable rather than error if
binutils too old") added a small test in arch/x86/Makefile because
binutils 2.22 or newer is needed to properly support elf32-x86-64. This
check is no longer necessary, as the minimum supported version of
binutils is 2.23, which is enforced at configuration time with
scripts/min-tool-version.sh.

Remove this check and replace all uses of CONFIG_X86_X32 with
CONFIG_X86_X32_ABI, as two symbols are no longer necessary.

[nathan: Rebase, fix up a few places where CONFIG_X86_X32 was still
used, and simplify commit message to satisfy -tip requirements]

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220314194842.3452-2-nathan@kernel.org
---
arch/x86/Kconfig | 8 ++------
arch/x86/Makefile | 16 ----------------
arch/x86/entry/syscalls/Makefile | 2 +-
arch/x86/include/asm/syscall_wrapper.h | 6 +++---
arch/x86/include/asm/vdso.h | 2 +-
arch/x86/kernel/process_64.c | 2 +-
fs/fuse/ioctl.c | 2 +-
fs/xfs/xfs_ioctl32.c | 2 +-
sound/core/control_compat.c | 16 ++++++++--------
sound/core/pcm_compat.c | 20 ++++++++++----------
10 files changed, 28 insertions(+), 48 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 870e0d1..b903bfc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2861,7 +2861,7 @@ config IA32_AOUT
help
Support old a.out binaries in the 32bit emulation.

-config X86_X32
+config X86_X32_ABI
bool "x32 ABI for 64-bit mode"
depends on X86_64
help
@@ -2870,10 +2870,6 @@ config X86_X32
full 64-bit register file and wide data path while leaving
pointers at 32 bits for smaller memory footprint.

- You will need a recent binutils (2.22 or later) with
- elf32_x86_64 support enabled to compile a kernel with this
- option set.
-
config COMPAT_32
def_bool y
depends on IA32_EMULATION || X86_32
@@ -2882,7 +2878,7 @@ config COMPAT_32

config COMPAT
def_bool y
- depends on IA32_EMULATION || X86_X32
+ depends on IA32_EMULATION || X86_X32_ABI

if COMPAT
config COMPAT_FOR_U64_ALIGNMENT
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index f29c2c9..63d50f6 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -152,22 +152,6 @@ else
KBUILD_CFLAGS += -mcmodel=kernel
endif

-ifdef CONFIG_X86_X32
- x32_ld_ok := $(call try-run,\
- /bin/echo -e '1: .quad 1b' | \
- $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
- $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMP.o" && \
- $(LD) -m elf32_x86_64 "$$TMP.o" -o "$$TMP",y,n)
- ifeq ($(x32_ld_ok),y)
- CONFIG_X86_X32_ABI := y
- KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
- KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
- else
- $(warning CONFIG_X86_X32 enabled but no binutils support)
- endif
-endif
-export CONFIG_X86_X32_ABI
-
#
# If the function graph tracer is used with mcount instead of fentry,
# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
diff --git a/arch/x86/entry/syscalls/Makefile b/arch/x86/entry/syscalls/Makefile
index 5b3efed..7f3886e 100644
--- a/arch/x86/entry/syscalls/Makefile
+++ b/arch/x86/entry/syscalls/Makefile
@@ -67,7 +67,7 @@ uapisyshdr-y += unistd_32.h unistd_64.h unistd_x32.h
syshdr-y += syscalls_32.h
syshdr-$(CONFIG_X86_64) += unistd_32_ia32.h unistd_64_x32.h
syshdr-$(CONFIG_X86_64) += syscalls_64.h
-syshdr-$(CONFIG_X86_X32) += syscalls_x32.h
+syshdr-$(CONFIG_X86_X32_ABI) += syscalls_x32.h
syshdr-$(CONFIG_XEN) += xen-hypercalls.h

uapisyshdr-y := $(addprefix $(uapi)/, $(uapisyshdr-y))
diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index 6a2827d..59358d1 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -159,7 +159,7 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
#endif /* CONFIG_IA32_EMULATION */

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
/*
* For the x32 ABI, we need to create a stub for compat_sys_*() which is aware
* of the x86-64-style parameter ordering of x32 syscalls. The syscalls common
@@ -177,12 +177,12 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);

#define __X32_COMPAT_SYS_NI(name) \
__SYS_NI(x64, compat_sys_##name)
-#else /* CONFIG_X86_X32 */
+#else /* CONFIG_X86_X32_ABI */
#define __X32_COMPAT_SYS_STUB0(name)
#define __X32_COMPAT_SYS_STUBx(x, name, ...)
#define __X32_COMPAT_COND_SYSCALL(name)
#define __X32_COMPAT_SYS_NI(name)
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */

#ifdef CONFIG_COMPAT
diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h
index 98aa103..2963a2f 100644
--- a/arch/x86/include/asm/vdso.h
+++ b/arch/x86/include/asm/vdso.h
@@ -37,7 +37,7 @@ struct vdso_image {
extern const struct vdso_image vdso_image_64;
#endif

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
extern const struct vdso_image vdso_image_x32;
#endif

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 3402ede..e459253 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -681,7 +681,7 @@ void set_personality_64bit(void)

static void __set_personality_x32(void)
{
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
if (current->mm)
current->mm->context.flags = 0;

diff --git a/fs/fuse/ioctl.c b/fs/fuse/ioctl.c
index df58966..33cde4b 100644
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -170,7 +170,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
#else
if (flags & FUSE_IOCTL_COMPAT) {
inarg.flags |= FUSE_IOCTL_32BIT;
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
if (in_x32_syscall())
inarg.flags |= FUSE_IOCTL_COMPAT_X32;
#endif
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index 004ed2a..ca25ed8 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -217,7 +217,7 @@ xfs_compat_ioc_fsbulkstat(
inumbers_fmt_pf inumbers_func = xfs_fsinumbers_fmt_compat;
bulkstat_one_fmt_pf bs_one_func = xfs_fsbulkstat_one_fmt_compat;

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
if (in_x32_syscall()) {
/*
* ... but on x32 the input xfs_fsop_bulkreq has pointers
diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c
index edff063..d8a86d1 100644
--- a/sound/core/control_compat.c
+++ b/sound/core/control_compat.c
@@ -150,7 +150,7 @@ struct snd_ctl_elem_value32 {
unsigned char reserved[128];
};

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
/* x32 has a different alignment for 64bit values from ia32 */
struct snd_ctl_elem_value_x32 {
struct snd_ctl_elem_id id;
@@ -162,7 +162,7 @@ struct snd_ctl_elem_value_x32 {
} value;
unsigned char reserved[128];
};
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */

/* get the value type and count of the control */
static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
@@ -347,7 +347,7 @@ static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
return ctl_elem_write_user(file, data32, &data32->value);
}

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
static int snd_ctl_elem_read_user_x32(struct snd_card *card,
struct snd_ctl_elem_value_x32 __user *data32)
{
@@ -359,7 +359,7 @@ static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
{
return ctl_elem_write_user(file, data32, &data32->value);
}
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */

/* add or replace a user control */
static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
@@ -418,10 +418,10 @@ enum {
SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */
};

static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
@@ -460,12 +460,12 @@ static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, uns
return snd_ctl_elem_add_compat(ctl, argp, 0);
case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
return snd_ctl_elem_add_compat(ctl, argp, 1);
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
case SNDRV_CTL_IOCTL_ELEM_READ_X32:
return snd_ctl_elem_read_user_x32(ctl->card, argp);
case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
return snd_ctl_elem_write_user_x32(ctl, argp);
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */
}

down_read(&snd_ioctl_rwsem);
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index e4e1768..917c5b4 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -147,13 +147,13 @@ static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream
return err;
}

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
/* X32 ABI has the same struct as x86-64 for snd_pcm_channel_info */
static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
struct snd_pcm_channel_info __user *src);
#define snd_pcm_ioctl_channel_info_x32(s, p) \
snd_pcm_channel_info_user(s, p)
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */

struct compat_snd_pcm_status64 {
snd_pcm_state_t state;
@@ -375,7 +375,7 @@ static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
return err;
}

-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
/* X32 ABI has 64bit timespec and 64bit alignment */
struct snd_pcm_mmap_status_x32 {
snd_pcm_state_t state;
@@ -468,7 +468,7 @@ static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,

return 0;
}
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */

#ifdef __BIG_ENDIAN
typedef char __pad_before_u32[4];
@@ -560,10 +560,10 @@ enum {
SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
SNDRV_PCM_IOCTL_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64),
SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64),
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info),
SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32),
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */
};

static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
@@ -607,10 +607,10 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
case __SNDRV_PCM_IOCTL_SYNC_PTR32:
return snd_pcm_common_ioctl(file, substream, cmd, argp);
case __SNDRV_PCM_IOCTL_SYNC_PTR64:
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
if (in_x32_syscall())
return snd_pcm_ioctl_sync_ptr_x32(substream, argp);
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */
return snd_pcm_ioctl_sync_ptr_buggy(substream, argp);
case SNDRV_PCM_IOCTL_HW_REFINE32:
return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
@@ -642,10 +642,10 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
return snd_pcm_status_user_compat64(substream, argp, false);
case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64:
return snd_pcm_status_user_compat64(substream, argp, true);
-#ifdef CONFIG_X86_X32
+#ifdef CONFIG_X86_X32_ABI
case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32:
return snd_pcm_ioctl_channel_info_x32(substream, argp);
-#endif /* CONFIG_X86_X32 */
+#endif /* CONFIG_X86_X32_ABI */
}

return -ENOIOCTLCMD;