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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 23:36:07 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 23:36:07 +0300 |
| commit | 029f56db6ac248769f2c260bfaf3c3c0e23e904c (patch) | |
| tree | 78c03b03258c0ac5d7b9546acc2ba14e87e277fd /arch/x86/include/asm/uaccess.h | |
| parent | 7cd4ecd9177b94af783b8e21de7c65b41a871342 (diff) | |
| parent | aa5cacdc29d76a005cbbee018a47faa6e724dd2d (diff) | |
| download | linux-029f56db6ac248769f2c260bfaf3c3c0e23e904c.tar.xz | |
Merge tag 'x86_asm_for_v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 asm updates from Borislav Petkov:
"Two asm wrapper fixes:
- Use XORL instead of XORQ to avoid a REX prefix and save some bytes
in the .fixup section, by Uros Bizjak.
- Replace __force_order dummy variable with a memory clobber to fix
LLVM requiring a definition for former and to prevent memory
accesses from still being cached/reordered, by Arvind Sankar"
* tag 'x86_asm_for_v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/asm: Replace __force_order with a memory clobber
x86/uaccess: Use XORL %0,%0 in __get_user_asm()
Diffstat (limited to 'arch/x86/include/asm/uaccess.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index aa60c239931b..477c503f2753 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -418,7 +418,7 @@ do { \ "2:\n" \ ".section .fixup,\"ax\"\n" \ "3: mov %[efault],%[errout]\n" \ - " xor"itype" %[output],%[output]\n" \ + " xorl %k[output],%k[output]\n" \ " jmp 2b\n" \ ".previous\n" \ _ASM_EXTABLE_UA(1b, 3b) \ |