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xtensa: fix mb and wmb definitions 

Define mb and wmb as memw to force memory barrier.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2012-11-24 06:22:08 +04:00 committed by Chris Zankel
parent 71872b5fb2
commit 599bf77a0d
1 changed files with 3 additions and 3 deletions
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6
arch/xtensa/include/asm/barrier.h
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@ -3,7 +3,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 - 2005 Tensilica Inc.
* Copyright (C) 2001 - 2012 Tensilica Inc.
*/
#ifndef _XTENSA_SYSTEM_H
@ -12,8 +12,8 @@
#define smp_read_barrier_depends() do { } while(0)
#define read_barrier_depends() do { } while(0)
#define mb() barrier()
#define rmb() mb()
#define mb() ({ __asm__ __volatile__("memw" : : : "memory"); })
#define rmb() barrier()
#define wmb() mb()
#ifdef CONFIG_SMP