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x86/speculation: Fix up array_index_nospec_mask() asm constraint

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Allow the compiler to handle @size as an immediate value or memory
directly rather than allocating a register.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/151797010204.1289.1510000292250184993.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dan Williams 2018-02-06 18:22:40 -08:00 committed by Ingo Molnar
parent 3b3a371cc9
commit be3233fbfc
1 changed files with 1 additions and 1 deletions
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arch/x86/include/asm/barrier.h
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@ -40,7 +40,7 @@ static inline unsigned long array_index_mask_nospec(unsigned long index,
asm ("cmp %1,%2; sbb %0,%0;" asm ("cmp %1,%2; sbb %0,%0;"
:"=r" (mask) :"=r" (mask)
:"r"(size),"r" (index) :"g"(size),"r" (index)
:"cc"); :"cc");
return mask; return mask;
} }