diff options
Diffstat (limited to 'include/asm-sh')
| -rw-r--r-- | include/asm-sh/atomic.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-sh/atomic.h b/include/asm-sh/atomic.h index 3c4f805da1a..a148c762d36 100644 --- a/include/asm-sh/atomic.h +++ b/include/asm-sh/atomic.h @@ -87,6 +87,20 @@ static __inline__ int atomic_sub_return(int i, atomic_t * v) #define atomic_inc(v) atomic_add(1,(v)) #define atomic_dec(v) atomic_sub(1,(v)) +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 int mask, atomic_t *v) { unsigned long flags; |