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-rw-r--r--include/asm-cris/atomic.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/asm-cris/atomic.h b/include/asm-cris/atomic.h
index 8c2e78304523..45891f7de00f 100644
--- a/include/asm-cris/atomic.h
+++ b/include/asm-cris/atomic.h
@@ -123,6 +123,19 @@ static inline int atomic_inc_and_test(volatile atomic_t *v)
return retval;
}
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+ int ret;
+ unsigned long flags;
+
+ cris_atomic_save(v, flags);
+ ret = v->counter;
+ if (likely(ret == old))
+ v->counter = new;
+ cris_atomic_restore(v, flags);
+ return ret;
+}
+
/* Atomic operations are already serializing */
#define smp_mb__before_atomic_dec() barrier()
#define smp_mb__after_atomic_dec() barrier()