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| author | Peter Zijlstra <peterz@infradead.org> | 2015-05-12 10:52:27 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 08:31:59 +0200 |
| commit | ab3f02fc237211f0583c1e7ba3bf504747be9b8d (patch) | |
| tree | c859733055aed0ba98fcd4e6d3f160a86deb7d8c /arch/sparc | |
| parent | 6ce47fd961fa8fb206433789d7754c73cab3b5d0 (diff) | |
| download | lwn-ab3f02fc237211f0583c1e7ba3bf504747be9b8d.tar.gz lwn-ab3f02fc237211f0583c1e7ba3bf504747be9b8d.zip | |
locking/arch: Add WRITE_ONCE() to set_mb()
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/include/asm/barrier_64.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/barrier_64.h b/arch/sparc/include/asm/barrier_64.h index 76648941fea7..125fec7512f4 100644 --- a/arch/sparc/include/asm/barrier_64.h +++ b/arch/sparc/include/asm/barrier_64.h @@ -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() |