From 85f651794c46e8e3faf204a767d1caa7f9f278f0 Mon Sep 17 00:00:00 2001 From: Hirokazu Takata Date: Wed, 27 Sep 2006 01:50:24 -0700 Subject: [PATCH] [PATCH] m32r: revise __raw_read_trylock() Signed-off-by: Hirokazu Takata Cc: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-m32r/spinlock.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) 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) { -- 2.20.1