x86/speculation: Fix up array_index_nospec_mask() asm constraint
authorDan Williams <dan.j.williams@intel.com>
Wed, 7 Feb 2018 02:22:40 +0000 (18:22 -0800)
committerIngo Molnar <mingo@kernel.org>
Thu, 15 Feb 2018 00:15:50 +0000 (01:15 +0100)
commitbe3233fbfcb8f5acb6e3bcd0895c3ef9e100d470
tree51a34964316ab3752cf6dd8d0235798cc48bd978
parent3b3a371cc9bc980429baabe0a8e5f307f3d1f463
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>
arch/x86/include/asm/barrier.h