diff options
| author | Len Brown <len.brown@intel.com> | 2006-01-07 03:50:18 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2006-01-07 03:50:18 -0500 |
| commit | ed03f430cdc8c802652467e9097606fedc2c7abc (patch) | |
| tree | 30941ec1e6f93e99358fefe18175e5dd800a4379 /include/asm-ia64/spinlock.h | |
| parent | ed349a8a0a780ed27e2a765f16cee54d9b63bfee (diff) | |
| parent | 6f957eaf79356a32e838f5f262ee9a60544b1d5b (diff) | |
Pull pnpacpi into acpica branch
Diffstat (limited to 'include/asm-ia64/spinlock.h')
| -rw-r--r-- | include/asm-ia64/spinlock.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/include/asm-ia64/spinlock.h b/include/asm-ia64/spinlock.h index 5b78611411c3..0c91a76c5ea3 100644 --- a/include/asm-ia64/spinlock.h +++ b/include/asm-ia64/spinlock.h @@ -201,6 +201,16 @@ static inline void __raw_write_unlock(raw_rwlock_t *x) #endif /* !ASM_SUPPORTED */ -#define __raw_read_trylock(lock) generic__raw_read_trylock(lock) +static inline int __raw_read_trylock(raw_rwlock_t *x) +{ + union { + raw_rwlock_t lock; + __u32 word; + } old, new; + old.lock = new.lock = *x; + old.lock.write_lock = new.lock.write_lock = 0; + ++new.lock.read_counter; + return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word; +} #endif /* _ASM_IA64_SPINLOCK_H */ |