53 static __always_inline int rwbase_read_trylock(struct rwbase_rt *rwb)  in rwbase_read_trylock()  argument
61 	for (r = atomic_read(&rwb->readers); r < 0;) {  in rwbase_read_trylock()
62 		if (likely(atomic_try_cmpxchg_acquire(&rwb->readers, &r, r + 1)))  in rwbase_read_trylock()
68 static int __sched __rwbase_read_lock(struct rwbase_rt *rwb,  in __rwbase_read_lock()  argument
71 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in __rwbase_read_lock()
107 	trace_contention_begin(rwb, LCB_F_RT | LCB_F_READ);  in __rwbase_read_lock()
123 		atomic_inc(&rwb->readers);  in __rwbase_read_lock()
128 	trace_contention_end(rwb, ret);  in __rwbase_read_lock()
133 static __always_inline int rwbase_read_lock(struct rwbase_rt *rwb,  in rwbase_read_lock()  argument
138 	if (rwbase_read_trylock(rwb))  in rwbase_read_lock()
141 	return __rwbase_read_lock(rwb, state);  in rwbase_read_lock()
144 static void __sched __rwbase_read_unlock(struct rwbase_rt *rwb,  in __rwbase_read_unlock()  argument
147 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in __rwbase_read_unlock()
168 static __always_inline void rwbase_read_unlock(struct rwbase_rt *rwb,  in rwbase_read_unlock()  argument
177 	if (unlikely(atomic_dec_and_test(&rwb->readers)))  in rwbase_read_unlock()
178 		__rwbase_read_unlock(rwb, state);  in rwbase_read_unlock()
181 static inline void __rwbase_write_unlock(struct rwbase_rt *rwb, int bias,  in __rwbase_write_unlock()  argument
184 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in __rwbase_write_unlock()
190 	(void)atomic_add_return_release(READER_BIAS - bias, &rwb->readers);  in __rwbase_write_unlock()
195 static inline void rwbase_write_unlock(struct rwbase_rt *rwb)  in rwbase_write_unlock()  argument
197 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_unlock()
201 	__rwbase_write_unlock(rwb, WRITER_BIAS, flags);  in rwbase_write_unlock()
204 static inline void rwbase_write_downgrade(struct rwbase_rt *rwb)  in rwbase_write_downgrade()  argument
206 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_downgrade()
211 	__rwbase_write_unlock(rwb, WRITER_BIAS - 1, flags);  in rwbase_write_downgrade()
214 static inline bool __rwbase_write_trylock(struct rwbase_rt *rwb)  in __rwbase_write_trylock()  argument
217 	lockdep_assert_held(&rwb->rtmutex.wait_lock);  in __rwbase_write_trylock()
223 	if (!atomic_read_acquire(&rwb->readers)) {  in __rwbase_write_trylock()
224 		atomic_set(&rwb->readers, WRITER_BIAS);  in __rwbase_write_trylock()
231 static int __sched rwbase_write_lock(struct rwbase_rt *rwb,  in rwbase_write_lock()  argument
234 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_lock()
242 	atomic_sub(READER_BIAS, &rwb->readers);  in rwbase_write_lock()
247 	if (__rwbase_write_trylock(rwb))  in rwbase_write_lock()
251 	trace_contention_begin(rwb, LCB_F_RT | LCB_F_WRITE);  in rwbase_write_lock()
256 			__rwbase_write_unlock(rwb, 0, flags);  in rwbase_write_lock()
258 			trace_contention_end(rwb, -EINTR);  in rwbase_write_lock()
262 		if (__rwbase_write_trylock(rwb))  in rwbase_write_lock()
272 	trace_contention_end(rwb, 0);  in rwbase_write_lock()
280 static inline int rwbase_write_trylock(struct rwbase_rt *rwb)  in rwbase_write_trylock()  argument
282 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_trylock()
288 	atomic_sub(READER_BIAS, &rwb->readers);  in rwbase_write_trylock()
291 	if (__rwbase_write_trylock(rwb)) {  in rwbase_write_trylock()
295 	__rwbase_write_unlock(rwb, 0, flags);  in rwbase_write_trylock()