52 static inline void arch_read_lock(arch_rwlock_t *rw)  in arch_read_lock()  argument
55 	do old = rw->lock;  in arch_read_lock()
56 	while (!old || __sl_cas(&rw->lock, old, old-1) != old);  in arch_read_lock()
59 static inline void arch_read_unlock(arch_rwlock_t *rw)  in arch_read_unlock()  argument
62 	do old = rw->lock;  in arch_read_unlock()
63 	while (__sl_cas(&rw->lock, old, old+1) != old);  in arch_read_unlock()
66 static inline void arch_write_lock(arch_rwlock_t *rw)  in arch_write_lock()  argument
68 	while (__sl_cas(&rw->lock, RW_LOCK_BIAS, 0) != RW_LOCK_BIAS);  in arch_write_lock()
71 static inline void arch_write_unlock(arch_rwlock_t *rw)  in arch_write_unlock()  argument
73 	__sl_cas(&rw->lock, 0, RW_LOCK_BIAS);  in arch_write_unlock()
76 static inline int arch_read_trylock(arch_rwlock_t *rw)  in arch_read_trylock()  argument
79 	do old = rw->lock;  in arch_read_trylock()
80 	while (old && __sl_cas(&rw->lock, old, old-1) != old);  in arch_read_trylock()
84 static inline int arch_write_trylock(arch_rwlock_t *rw)  in arch_write_trylock()  argument
86 	return __sl_cas(&rw->lock, RW_LOCK_BIAS, 0) == RW_LOCK_BIAS;  in arch_write_trylock()