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MN10300: atomic_read() should ensure it emits a load
author
David Howells
<dhowells@redhat.com>
Mon, 14 Mar 2011 14:49:44 +0000
(14:49 +0000)
committer
David Howells
<dhowells@redhat.com>
Mon, 14 Mar 2011 14:51:25 +0000
(14:51 +0000)
atomic_read() needs to ensure that it emits a load (which it can do by using
ACCESS_ONCE()).
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: David Howells <dhowells@redhat.com>
arch/mn10300/include/asm/atomic.h
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diff --git
a/arch/mn10300/include/asm/atomic.h
b/arch/mn10300/include/asm/atomic.h
index
92d2f92
..
9d773a6
100644
(file)
--- a/
arch/mn10300/include/asm/atomic.h
+++ b/
arch/mn10300/include/asm/atomic.h
@@
-139,7
+139,7
@@
static inline unsigned long __cmpxchg(volatile unsigned long *m,
* Atomically reads the value of @v. Note that the guaranteed
* useful range of an atomic_t is only 24 bits.
*/
-#define atomic_read(v) (
(v)->counter
)
+#define atomic_read(v) (
ACCESS_ONCE((v)->counter)
)
/**
* atomic_set - set atomic variable