linux-kernel - [RFC PATCH] x86: Use ACCESS_ONCE() for atomic

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Message-Id: <1411415590-12193-1-git-send-email-bobby.prani@gmail.com>
Date:	Mon, 22 Sep 2014 15:53:09 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE...),
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE...)
Subject: [RFC PATCH] x86: Use ACCESS_ONCE() for atomic_read()

Use the much easier to read ACCESS_ONCE() which is basically the same thing as
the cast to volatile.

Please note the change in volatile cast: ACCESS_ONCE(v)->counter to
ACCESS_ONCE(v->counter).

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 arch/x86/include/asm/atomic.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/atomic.h b/arch/x86/include/asm/atomic.h
index fa92e93..dea3434 100644
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -24,7 +24,7 @@
  */
 static inline int atomic_read(const atomic_t *v)
 {
-	return (*(volatile int *)&(v)->counter);
+	return ACCESS_ONCE(v->counter);
 }
 
 /**
-- 
2.1.0

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