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make atomic_read() behave consistently on i386

PATCH In review Chris Snook 1 participant 1 message Aug 9, 2007

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Networking Network drivers Generic include/asm header files Atomic infrastructure
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Chris Snook

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PATCH 8/24 make atomic_read() behave consistently on i386

From: Chris Snook <[email protected]>

Make atomic_read() volatile on i386, to ensure memory is actually read each time.

Signed-off-by Chris Snook <[email protected]>
include/asm-i386/atomic.h +1 -1
@@ -25,7 +25,7 @@ typedef struct { int counter; } atomic_t
  * 
  * 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