linux-kernel - [PATCH 13/24] make atomic_read() behave consistently on mips

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Date:	Thu, 9 Aug 2007 10:00:04 -0400
From:	Chris Snook <csnook@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	torvalds@...ux-foundation.org
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org, ak@...e.de,
	heiko.carstens@...ibm.com, davem@...emloft.net,
	schwidefsky@...ibm.com, wensong@...ux-vs.org, horms@...ge.net.au,
	wjiang@...ilience.com, cfriesen@...tel.com, zlynx@....org,
	rpjday@...dspring.com, jesper.juhl@...il.com
Subject: [PATCH 13/24] make atomic_read() behave consistently on mips

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

Purify volatile use for atomic[64]_t on mips.

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

--- linux-2.6.23-rc2-orig/include/asm-mips/atomic.h	2007-08-08 17:48:53.000000000 -0400
+++ linux-2.6.23-rc2/include/asm-mips/atomic.h	2007-08-09 07:02:50.000000000 -0400
@@ -20,7 +20,7 @@
 #include <asm/war.h>
 #include <asm/system.h>
 
-typedef struct { volatile int counter; } atomic_t;
+typedef struct { int counter; } atomic_t;
 
 #define ATOMIC_INIT(i)    { (i) }
 
@@ -30,7 +30,7 @@ typedef struct { volatile int counter; }
  *
  * Atomically reads the value of @v.
  */
-#define atomic_read(v)		((v)->counter)
+#define atomic_read(v)		(*(volatile int *)&(v)->counter)
 
 /*
  * atomic_set - set atomic variable
@@ -404,7 +404,7 @@ static __inline__ int atomic_add_unless(
 
 #ifdef CONFIG_64BIT
 
-typedef struct { volatile long counter; } atomic64_t;
+typedef struct { long counter; } atomic64_t;
 
 #define ATOMIC64_INIT(i)    { (i) }
 
@@ -413,7 +413,7 @@ typedef struct { volatile long counter; 
  * @v: pointer of type atomic64_t
  *
  */
-#define atomic64_read(v)	((v)->counter)
+#define atomic64_read(v)	(*(volatile long *)&(v)->counter)
 
 /*
  * atomic64_set - set atomic variable
-
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