Messages in this thread Patch in this message |  | | | Date | Thu, 9 Aug 2007 09:49:14 -0400 | | From | Chris Snook <> | | Subject | [PATCH 8/24] make atomic_read() behave consistently on i386 |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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