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| author | Hirokazu Takata <takata.hirokazu@renesas.com> | 2006-09-27 01:50:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-27 08:26:15 -0700 |
| commit | 85f651794c46e8e3faf204a767d1caa7f9f278f0 (patch) | |
| tree | a57f99fa8f84c95a7a9899d1ab28a118c7ad15e3 /include/asm-m32r/spinlock.h | |
| parent | a27f3113322edff36743014cc9e752a21ffc0324 (diff) | |
| download | blackbird-op-linux-85f651794c46e8e3faf204a767d1caa7f9f278f0.tar.gz blackbird-op-linux-85f651794c46e8e3faf204a767d1caa7f9f278f0.zip | |
[PATCH] m32r: revise __raw_read_trylock()
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>
Diffstat (limited to 'include/asm-m32r/spinlock.h')
| -rw-r--r-- | include/asm-m32r/spinlock.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-m32r/spinlock.h b/include/asm-m32r/spinlock.h index f94c1a673569..f9f90727a4a1 100644 --- a/include/asm-m32r/spinlock.h +++ b/include/asm-m32r/spinlock.h @@ -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) { |
