linux-kernel - [PATCH 3/23] make atomic_read() and atomic

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Message-ID: <20070813110946.GC24018@shell.boston.redhat.com>
Date:	Mon, 13 Aug 2007 07:09:46 -0400
From:	Chris Snook <csnook@...hat.com>
To:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	Segher Boessenkool <segher@...nel.crashing.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Chris Friesen <cfriesen@...tel.com>,
	"Robert P. J. Day" <rpjday@...dspring.com>
Subject: [PATCH 3/23] make atomic_read() and atomic_set() behavior consistent on arm

From: Chris Snook <csnook@...hat.com>

Use volatile consistently in atomic.h on arm.

Signed-off-by: Chris Snook <csnook@...hat.com>

--- linux-2.6.23-rc3-orig/include/asm-arm/atomic.h	2007-07-08 19:32:17.000000000 -0400
+++ linux-2.6.23-rc3/include/asm-arm/atomic.h	2007-08-13 04:44:50.000000000 -0400
@@ -14,13 +14,16 @@
 #include <linux/compiler.h>
 #include <asm/system.h>
 
-typedef struct { volatile int counter; } atomic_t;
+typedef struct { int counter; } atomic_t;
 
 #define ATOMIC_INIT(i)	{ (i) }
 
 #ifdef __KERNEL__
 
-#define atomic_read(v)	((v)->counter)
+static inline int atomic_read(atomic_t *v)
+{
+        return *(volatile int *)&v->counter;
+}
 
 #if __LINUX_ARM_ARCH__ >= 6
 
-
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