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Merge tag 'x86_asm_for_v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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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()
This commit is contained in:
Linus Torvalds
2020-10-13 13:36:07 -07:00
parent 7cd4ecd917 aa5cacdc29
commit 029f56db6a
4 changed files with 18 additions and 25 deletions
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2
arch/x86/include/asm/uaccess.h
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@@ -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) \