* [PATCH 8/24] make atomic_read() behave consistently on i386
@ 2007-08-09 13:49 Chris Snook
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From: Chris Snook @ 2007-08-09 13:49 UTC (permalink / raw)
To: linux-kernel, linux-arch, torvalds
Cc: netdev, akpm, ak, heiko.carstens, davem, schwidefsky, wensong,
horms, wjiang, cfriesen, zlynx, rpjday, jesper.juhl
From: Chris Snook <csnook@redhat.com>
Make atomic_read() volatile on i386, to ensure memory is actually read
each time.
Signed-off-by: Chris Snook <csnook@redhat.com>
--- linux-2.6.23-rc2-orig/include/asm-i386/atomic.h 2007-07-08 19:32:17.000000000 -0400
+++ linux-2.6.23-rc2/include/asm-i386/atomic.h 2007-08-09 06:47:47.000000000 -0400
@@ -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
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2007-08-09 13:49 [PATCH 8/24] make atomic_read() behave consistently on i386 Chris Snook
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