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-rw-r--r--include/asm-sh/spinlock.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-sh/spinlock.h b/include/asm-sh/spinlock.h
index 54458fd..2586eef 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)
{
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