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Subject[PATCH] x86/nospec: Fixup array_index_nospec_mask() asm constraint
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Date
Allow the compiler to handle @size as an immediate value rather than
allocating a register.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/x86/include/asm/barrier.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index 30d406146016..9e9d6f27825a 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -40,7 +40,7 @@ static inline unsigned long array_index_mask_nospec(unsigned long index,

asm ("cmp %1,%2; sbb %0,%0;"
:"=r" (mask)
- :"r"(size),"r" (index)
+ :"ir"(size),"r" (index)
:"cc");
return mask;
}
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