From: Chris Snook <[EMAIL PROTECTED]>
Purify volatile use for atomic_t on sh.
Signed-off-by: Chris Snook <[EMAIL PROTECTED]>
--- linux-2.6.23-rc2-orig/include/asm-sh/atomic.h 2007-07-08
19:32:17.000000000 -0400
+++ linux-2.6.23-rc2/include/asm-sh/atomic.h 2007-08-09 07:21:33.000000000
-0400
@@ -7,11 +7,15 @@
*
*/
-typedef struct { volatile int counter; } atomic_t;
+typedef struct { int counter; } atomic_t;
#define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
-#define atomic_read(v) ((v)->counter)
+/*
+ * Casting to volatile here minimizes the need for barriers,
+ * without having to declare the type itself as volatile.
+ */
+#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_set(v,i) ((v)->counter = (i))
#include <linux/compiler.h>
-
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