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x86/speculation: Fix up array_index_nospec_mask() asm constraint

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commit be3233fbfcb8f5acb6e3bcd0895c3ef9e100d470 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu>
Reviewed-by: Matt Helsley (VMware) <matt.helsley@gmail.com>
Reviewed-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Bo Gan <ganb@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Williams 2018-07-14 02:31:32 -07:00 committed by Greg Kroah-Hartman
parent d10b55dd5a
commit 1af5c96615
1 changed files with 1 additions and 1 deletions
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2
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 volatile ("cmp %1,%2; sbb %0,%0;"
:"=r" (mask)
:"r"(size),"r" (index)
:"g"(size),"r" (index)
:"cc");
return mask;
}