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()
108 	trace_contention_begin(rwb, LCB_F_RT | LCB_F_READ);  in __rwbase_read_lock()
124 		atomic_inc(&rwb->readers);  in __rwbase_read_lock()
134 	trace_contention_end(rwb, ret);  in __rwbase_read_lock()
139 static __always_inline int rwbase_read_lock(struct rwbase_rt *rwb,  in rwbase_read_lock()  argument
144 	if (rwbase_read_trylock(rwb))  in rwbase_read_lock()
147 	return __rwbase_read_lock(rwb, state);  in rwbase_read_lock()
150 static void __sched __rwbase_read_unlock(struct rwbase_rt *rwb,  in __rwbase_read_unlock()  argument
153 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in __rwbase_read_unlock()
174 static __always_inline void rwbase_read_unlock(struct rwbase_rt *rwb,  in rwbase_read_unlock()  argument
183 	if (unlikely(atomic_dec_and_test(&rwb->readers)))  in rwbase_read_unlock()
184 		__rwbase_read_unlock(rwb, state);  in rwbase_read_unlock()
187 static inline void __rwbase_write_unlock(struct rwbase_rt *rwb, int bias,  in __rwbase_write_unlock()  argument
190 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in __rwbase_write_unlock()
196 	(void)atomic_add_return_release(READER_BIAS - bias, &rwb->readers);  in __rwbase_write_unlock()
201 static inline void rwbase_write_unlock(struct rwbase_rt *rwb)  in rwbase_write_unlock()  argument
203 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_unlock()
207 	__rwbase_write_unlock(rwb, WRITER_BIAS, flags);  in rwbase_write_unlock()
210 static inline void rwbase_write_downgrade(struct rwbase_rt *rwb)  in rwbase_write_downgrade()  argument
212 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_downgrade()
217 	__rwbase_write_unlock(rwb, WRITER_BIAS - 1, flags);  in rwbase_write_downgrade()
220 static inline bool __rwbase_write_trylock(struct rwbase_rt *rwb)  in __rwbase_write_trylock()  argument
223 	lockdep_assert_held(&rwb->rtmutex.wait_lock);  in __rwbase_write_trylock()
229 	if (!atomic_read_acquire(&rwb->readers)) {  in __rwbase_write_trylock()
230 		atomic_set(&rwb->readers, WRITER_BIAS);  in __rwbase_write_trylock()
237 static int __sched rwbase_write_lock(struct rwbase_rt *rwb,  in rwbase_write_lock()  argument
240 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_lock()
248 	atomic_sub(READER_BIAS, &rwb->readers);  in rwbase_write_lock()
253 	if (__rwbase_write_trylock(rwb))  in rwbase_write_lock()
257 	trace_contention_begin(rwb, LCB_F_RT | LCB_F_WRITE);  in rwbase_write_lock()
262 			__rwbase_write_unlock(rwb, 0, flags);  in rwbase_write_lock()
264 			trace_contention_end(rwb, -EINTR);  in rwbase_write_lock()
268 		if (__rwbase_write_trylock(rwb))  in rwbase_write_lock()
278 	trace_contention_end(rwb, 0);  in rwbase_write_lock()
286 static inline int rwbase_write_trylock(struct rwbase_rt *rwb)  in rwbase_write_trylock()  argument
288 	struct rt_mutex_base *rtm = &rwb->rtmutex;  in rwbase_write_trylock()
294 	atomic_sub(READER_BIAS, &rwb->readers);  in rwbase_write_trylock()
297 	if (__rwbase_write_trylock(rwb)) {  in rwbase_write_trylock()
301 	__rwbase_write_unlock(rwb, 0, flags);  in rwbase_write_trylock()