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x86: Use xadd helper more widely

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This covers the trivial cases from open-coded xadd to the xadd macros.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Link: http://lkml.kernel.org/r/4E5BCC40.3030501@goop.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Jeremy Fitzhardinge
2011-08-23 16:59:58 -07:00
committed by H. Peter Anvin
parent 433b352061
commit 8b8bc2f731
4 changed files with 5 additions and 23 deletions
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8
arch/x86/include/asm/rwsem.h
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@@ -204,13 +204,7 @@ static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
*/
static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
{
long tmp = delta;
asm volatile(LOCK_PREFIX "xadd %0,%1"
: "+r" (tmp), "+m" (sem->count)
: : "memory");
return tmp + delta;
return delta + xadd(&sem->count, delta);
}
#endif /* __KERNEL__ */