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Fix an assembly constraint that affected LLVM up to version 12.

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'core-urgent-2021-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 stack randomization fix from Ingo Molnar:
 "Fix an assembly constraint that affected LLVM up to version 12"

* tag 'core-urgent-2021-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  stack: Replace "o" output with "r" input constraint
This commit is contained in:
Linus Torvalds 2021-05-15 10:00:35 -07:00
commit 91b7a0f063
1 changed files with 1 additions and 1 deletions
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2
include/linux/randomize_kstack.h
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@ -38,7 +38,7 @@ void *__builtin_alloca(size_t size);
u32 offset = raw_cpu_read(kstack_offset); \
u8 *ptr = __builtin_alloca(KSTACK_OFFSET_MAX(offset)); \
/* Keep allocation even after "ptr" loses scope. */ \
asm volatile("" : "=o"(*ptr) :: "memory"); \
asm volatile("" :: "r"(ptr) : "memory"); \
} \
} while (0)