From ab3f02fc237211f0583c1e7ba3bf504747be9b8d Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 12 May 2015 10:52:27 +0200
Subject: 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>
---
 include/asm-generic/barrier.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'include/asm-generic')

diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index f5c40b0fadc2..3938716b44d7 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -67,7 +67,7 @@
 #endif
 
 #ifndef set_mb
-#define set_mb(var, value)  do { (var) = (value); mb(); } while (0)
+#define set_mb(var, value)  do { WRITE_ONCE(var, value); mb(); } while (0)
 #endif
 
 #ifndef smp_mb__before_atomic
-- 
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