102 #define arch_read_relax(rw) barrier()  argument
103 #define arch_write_relax(rw) barrier()  argument
108 static inline void arch_read_lock(arch_rwlock_t *rw)  in arch_read_lock()  argument
112 	old = __atomic_add(1, &rw->cnts);  in arch_read_lock()
114 		arch_read_lock_wait(rw);  in arch_read_lock()
117 static inline void arch_read_unlock(arch_rwlock_t *rw)  in arch_read_unlock()  argument
119 	__atomic_add_const_barrier(-1, &rw->cnts);  in arch_read_unlock()
122 static inline void arch_write_lock(arch_rwlock_t *rw)  in arch_write_lock()  argument
126 	if (!arch_try_cmpxchg(&rw->cnts, &old, 0x30000))  in arch_write_lock()
127 		arch_write_lock_wait(rw);  in arch_write_lock()
130 static inline void arch_write_unlock(arch_rwlock_t *rw)  in arch_write_unlock()  argument
132 	__atomic_add_barrier(-0x30000, &rw->cnts);  in arch_write_unlock()
136 static inline int arch_read_trylock(arch_rwlock_t *rw)  in arch_read_trylock()  argument
140 	old = READ_ONCE(rw->cnts);  in arch_read_trylock()
141 	return (!(old & 0xffff0000) && arch_try_cmpxchg(&rw->cnts, &old, old + 1));  in arch_read_trylock()
144 static inline int arch_write_trylock(arch_rwlock_t *rw)  in arch_write_trylock()  argument
148 	old = READ_ONCE(rw->cnts);  in arch_write_trylock()
149 	return !old && arch_try_cmpxchg(&rw->cnts, &old, 0x30000);  in arch_write_trylock()