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[PATCH] m32r: revise __raw_read_trylock()

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Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hirokazu Takata 2006-09-27 01:50:24 -07:00 committed by Linus Torvalds
parent a27f311332
commit 85f651794c
1 changed files with 8 additions and 1 deletions
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9
include/asm-m32r/spinlock.h
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@ -298,7 +298,14 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
);
}
#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 *lock)
{