diff options
Diffstat (limited to 'include/asm-h8300/atomic.h')
| -rw-r--r-- | include/asm-h8300/atomic.h | 13 |
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" |