102 static inline int arch_read_can_lock(arch_rwlock_t *rw)  in arch_read_can_lock()  argument
104 	return !arch_write_val_locked(rw->lock);  in arch_read_can_lock()
111 static inline int arch_write_can_lock(arch_rwlock_t *rw)  in arch_write_can_lock()  argument
113 	return rw->lock == 0;  in arch_write_can_lock()
116 extern void __read_lock_failed(arch_rwlock_t *rw);
118 static inline void arch_read_lock(arch_rwlock_t *rw)  in arch_read_lock()  argument
120 	u32 val = __insn_fetchaddgez4(&rw->lock, 1);  in arch_read_lock()
122 		__read_lock_failed(rw);  in arch_read_lock()
125 extern void __write_lock_failed(arch_rwlock_t *rw, u32 val);
127 static inline void arch_write_lock(arch_rwlock_t *rw)  in arch_write_lock()  argument
129 	u32 val = __insn_fetchor4(&rw->lock, __WRITE_LOCK_BIT);  in arch_write_lock()
131 		__write_lock_failed(rw, val);  in arch_write_lock()
134 static inline void arch_read_unlock(arch_rwlock_t *rw)  in arch_read_unlock()  argument
137 	__insn_fetchadd4(&rw->lock, -1);  in arch_read_unlock()
140 static inline void arch_write_unlock(arch_rwlock_t *rw)  in arch_write_unlock()  argument
143 	__insn_exch4(&rw->lock, 0);  /* Avoid waiting in the write buffer. */  in arch_write_unlock()
146 static inline int arch_read_trylock(arch_rwlock_t *rw)  in arch_read_trylock()  argument
148 	return !arch_write_val_locked(__insn_fetchaddgez4(&rw->lock, 1));  in arch_read_trylock()
151 static inline int arch_write_trylock(arch_rwlock_t *rw)  in arch_write_trylock()  argument
153 	u32 val = __insn_fetchor4(&rw->lock, __WRITE_LOCK_BIT);  in arch_write_trylock()
157 		__insn_fetchand4(&rw->lock, ~__WRITE_LOCK_BIT);  in arch_write_trylock()