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| author | Dan Williams <dan.j.williams@intel.com> | 2018-02-06 18:22:40 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-15 01:15:50 +0100 |
| commit | be3233fbfcb8f5acb6e3bcd0895c3ef9e100d470 (patch) | |
| tree | 51a34964316ab3752cf6dd8d0235798cc48bd978 /arch/x86/include/asm/barrier.h | |
| parent | 3b3a371cc9bc980429baabe0a8e5f307f3d1f463 (diff) | |
| download | linux-0-day-be3233fbfcb8f5acb6e3bcd0895c3ef9e100d470.tar.gz linux-0-day-be3233fbfcb8f5acb6e3bcd0895c3ef9e100d470.tar.xz | |
x86/speculation: Fix up array_index_nospec_mask() asm constraint
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>
Diffstat (limited to 'arch/x86/include/asm/barrier.h')
| -rw-r--r-- | arch/x86/include/asm/barrier.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h index 30d4061460164..e1259f043ae99 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) + :"g"(size),"r" (index) :"cc"); return mask; } |