From: Chris Snook <csnook@redhat.com>
To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
torvalds@linux-foundation.org
Cc: netdev@vger.kernel.org, akpm@linux-foundation.org, ak@suse.de,
heiko.carstens@de.ibm.com, davem@davemloft.net,
schwidefsky@de.ibm.com, wensong@linux-vs.org, horms@verge.net.au,
wjiang@resilience.com, cfriesen@nortel.com, zlynx@acm.org,
rpjday@mindspring.com, jesper.juhl@gmail.com
Subject: [PATCH 23/24] make atomic_read() behave consistently on xtensa
Date: Thu, 9 Aug 2007 10:20:34 -0400 [thread overview]
Message-ID: <20070809142034.GA19403@shell.boston.redhat.com> (raw)
From: Chris Snook <csnook@redhat.com>
Purify volatile use for atomic_t on xtensa.
Signed-off-by: Chris Snook <csnook@redhat.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
reply other threads:[~2007-08-09 14:21 UTC|newest]
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