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locking/arch: Add WRITE_ONCE() to set_mb()

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Since we assume set_mb() to result in a single store followed by a
full memory barrier, employ WRITE_ONCE().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2015-05-12 10:52:27 +02:00
committed by Ingo Molnar
parent 6ce47fd961
commit ab3f02fc23
12 changed files with 12 additions and 12 deletions
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arch/sparc/include/asm/barrier_64.h
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@@ -41,7 +41,7 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
#define dma_wmb() wmb()
#define set_mb(__var, __value) \
do { __var = __value; membar_safe("#StoreLoad"); } while(0)
do { WRITE_ONCE(__var, __value); membar_safe("#StoreLoad"); } while(0)
#ifdef CONFIG_SMP
#define smp_mb() mb()