linux-kernel - [PATCH 23/24] make atomic_read() behave consistently on xtensa

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Date:	Thu, 9 Aug 2007 10:20:34 -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 23/24] make atomic_read() behave consistently on xtensa

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

Purify volatile use for atomic_t on xtensa.

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

--- linux-2.6.23-rc2-orig/include/asm-xtensa/atomic.h	2007-07-08 19:32:17.000000000 -0400
+++ linux-2.6.23-rc2/include/asm-xtensa/atomic.h	2007-08-09 07:54:59.000000000 -0400
@@ -15,7 +15,7 @@
 
 #include <linux/stringify.h>
 
-typedef struct { volatile int counter; } atomic_t;
+typedef struct { int counter; } atomic_t;
 
 #ifdef __KERNEL__
 #include <asm/processor.h>
@@ -47,7 +47,7 @@ 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
-
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