[PATCH] atomic: cmpxchg

Introduce an atomic_cmpxchg operation.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/asm-h8300/atomic.h b/include/asm-h8300/atomic.h
index 7230f6507995..d50439259491 100644
--- a/include/asm-h8300/atomic.h
+++ b/include/asm-h8300/atomic.h
@@ -82,6 +82,19 @@ static __inline__ int atomic_dec_and_test(atomic_t *v)
         return ret == 0;
 }
 
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+        int ret;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        ret = v->counter;
+        if (likely(ret == old))
+                v->counter = new;
+        local_irq_restore(flags);
+        return ret;
+}
+
 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
 {
         __asm__ __volatile__("stc ccr,r1l\n\t"