diff options
Diffstat (limited to 'include/asm-cris/atomic.h')
| -rw-r--r-- | include/asm-cris/atomic.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/asm-cris/atomic.h b/include/asm-cris/atomic.h index 8c2e7830452..45891f7de00 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() |