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authorPeter Zijlstra <peterz@infradead.org>2015-05-12 10:52:27 +0200
committerIngo Molnar <mingo@kernel.org>2015-05-19 08:31:59 +0200
commitab3f02fc237211f0583c1e7ba3bf504747be9b8d (patch)
treec859733055aed0ba98fcd4e6d3f160a86deb7d8c /arch/x86/um/asm
parent6ce47fd961fa8fb206433789d7754c73cab3b5d0 (diff)
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/x86/um/asm')
-rw-r--r--arch/x86/um/asm/barrier.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/um/asm/barrier.h b/arch/x86/um/asm/barrier.h
index 7e8a1a650435..cc0cb01f346d 100644
--- a/arch/x86/um/asm/barrier.h
+++ b/arch/x86/um/asm/barrier.h
@@ -39,7 +39,7 @@
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
-#define set_mb(var, value) do { var = value; barrier(); } while (0)
+#define set_mb(var, value) do { WRITE_ONCE(var, value); barrier(); } while (0)
#define read_barrier_depends() do { } while (0)
#define smp_read_barrier_depends() do { } while (0)