[ACPI] ACPICA 20060113

[linux-2.6-omap-h63xx.git] / include / asm-ia64 / spinlock.h

diff --git a/include/asm-ia64/spinlock.h b/include/asm-ia64/spinlock.h
index 5b78611411c30e244a650b230aaae7c62ec5a6e9..0c91a76c5ea3cff8decee9debe0cf45d696a83c7 100644 (file)
--- 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 */