106 #define arch_read_relax(rw) barrier()  argument
107 #define arch_write_relax(rw) barrier()  argument
112 static inline void arch_read_lock(arch_rwlock_t *rw)  in arch_read_lock()  argument
116 	old = __atomic_add(1, &rw->cnts);  in arch_read_lock()
118 		arch_read_lock_wait(rw);  in arch_read_lock()
121 static inline void arch_read_unlock(arch_rwlock_t *rw)  in arch_read_unlock()  argument
123 	__atomic_add_const_barrier(-1, &rw->cnts);  in arch_read_unlock()
126 static inline void arch_write_lock(arch_rwlock_t *rw)  in arch_write_lock()  argument
128 	if (!__atomic_cmpxchg_bool(&rw->cnts, 0, 0x30000))  in arch_write_lock()
129 		arch_write_lock_wait(rw);  in arch_write_lock()
132 static inline void arch_write_unlock(arch_rwlock_t *rw)  in arch_write_unlock()  argument
134 	__atomic_add_barrier(-0x30000, &rw->cnts);  in arch_write_unlock()
138 static inline int arch_read_trylock(arch_rwlock_t *rw)  in arch_read_trylock()  argument
142 	old = READ_ONCE(rw->cnts);  in arch_read_trylock()
144 		__atomic_cmpxchg_bool(&rw->cnts, old, old + 1));  in arch_read_trylock()
147 static inline int arch_write_trylock(arch_rwlock_t *rw)  in arch_write_trylock()  argument
151 	old = READ_ONCE(rw->cnts);  in arch_write_trylock()
152 	return !old && __atomic_cmpxchg_bool(&rw->cnts, 0, 0x30000);  in arch_write_trylock()