diff options
Diffstat (limited to 'include/asm-sh/spinlock.h')
| -rw-r--r-- | include/asm-sh/spinlock.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-sh/spinlock.h b/include/asm-sh/spinlock.h index 54458fd2498..2586eef07d5 100644 --- a/include/asm-sh/spinlock.h +++ b/include/asm-sh/spinlock.h @@ -88,7 +88,14 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw) __raw_spin_unlock(&rw->lock); } -#define __raw_read_trylock(lock) generic__raw_read_trylock(lock) +static inline int __raw_read_trylock(raw_rwlock_t *lock) +{ + atomic_t *count = (atomic_t*)lock; + if (atomic_dec_return(count) >= 0) + return 1; + atomic_inc(count); + return 0; +} static inline int __raw_write_trylock(raw_rwlock_t *rw) { |