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asm-generic: cmpxchg does not handle non-long arguments

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The version of cmpxchg defined in asm-generic/system.h does not handle
correctly non-long arguments. Use the version defined in cmpxchg.h
instead.

Signed-off-by: Mathieu Lacage <mathieu.lacage@inria.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Mathieu Lacage 2010-06-22 10:30:15 +02:00 committed by Arnd Bergmann
parent 8b9d40691e
commit c669112663
1 changed files with 1 additions and 19 deletions
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20
include/asm-generic/system.h
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@ -21,6 +21,7 @@
#include <linux/irqflags.h>
#include <asm/cmpxchg-local.h>
#include <asm/cmpxchg.h>
struct task_struct;
@ -136,25 +137,6 @@ unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
#define xchg(ptr, x) \
((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
static inline unsigned long __cmpxchg(volatile unsigned long *m,
unsigned long old, unsigned long new)
{
unsigned long retval;
unsigned long flags;
local_irq_save(flags);
retval = *m;
if (retval == old)
*m = new;
local_irq_restore(flags);
return retval;
}
#define cmpxchg(ptr, o, n) \
((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
(unsigned long)(o), \
(unsigned long)(n)))
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */