linux-kernel - [PATCH] arch/tile: Fix atomic_read() definition to use ACCESS

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Message-Id: <201103011931.p21JV3uD010192@farm-0010.internal.tilera.com>
Date:	Fri, 25 Feb 2011 08:46:38 -0500
From:	Chris Metcalf <cmetcalf@...era.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] arch/tile: Fix atomic_read() definition to use ACCESS_ONCE

This adds the volatile cast which forces the compiler to emit the load.
Suggested by Peter Zijlstra <peterz@...radead.org>.

Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
---
 arch/tile/include/asm/atomic.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h
index b8c49f9..75a1602 100644
--- a/arch/tile/include/asm/atomic.h
+++ b/arch/tile/include/asm/atomic.h
@@ -32,7 +32,7 @@
  */
 static inline int atomic_read(const atomic_t *v)
 {
-       return v->counter;
+	return ACCESS_ONCE(v->counter);
 }
 
 /**
-- 
1.6.5.2

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