diff options
Diffstat (limited to 'include/asm-v850')
| -rw-r--r-- | include/asm-v850/atomic.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h index e497166ca42b..bede3172ce7f 100644 --- a/include/asm-v850/atomic.h +++ b/include/asm-v850/atomic.h @@ -104,6 +104,22 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new) return ret; } +static inline int atomic_add_unless(atomic_t *v, int a, int u) +{ + int ret; + unsigned long flags; + + local_irq_save(flags); + ret = v->counter; + if (ret != u) + v->counter += a; + local_irq_restore(flags); + + return ret != u; +} + +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + /* Atomic operations are already serializing on ARM */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() |