38 static noinline void __down(struct semaphore *sem);
39 static noinline int __down_interruptible(struct semaphore *sem);
40 static noinline int __down_killable(struct semaphore *sem);
41 static noinline int __down_timeout(struct semaphore *sem, long timeout);
42 static noinline void __up(struct semaphore *sem, struct wake_q_head *wake_q);
55 void __sched down(struct semaphore *sem)  in down()  argument
60 	raw_spin_lock_irqsave(&sem->lock, flags);  in down()
61 	if (likely(sem->count > 0))  in down()
62 		sem->count--;  in down()
64 		__down(sem);  in down()
65 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down()
78 int __sched down_interruptible(struct semaphore *sem)  in down_interruptible()  argument
84 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_interruptible()
85 	if (likely(sem->count > 0))  in down_interruptible()
86 		sem->count--;  in down_interruptible()
88 		result = __down_interruptible(sem);  in down_interruptible()
89 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_interruptible()
105 int __sched down_killable(struct semaphore *sem)  in down_killable()  argument
111 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_killable()
112 	if (likely(sem->count > 0))  in down_killable()
113 		sem->count--;  in down_killable()
115 		result = __down_killable(sem);  in down_killable()
116 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_killable()
135 int __sched down_trylock(struct semaphore *sem)  in down_trylock()  argument
140 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_trylock()
141 	count = sem->count - 1;  in down_trylock()
143 		sem->count = count;  in down_trylock()
144 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_trylock()
160 int __sched down_timeout(struct semaphore *sem, long timeout)  in down_timeout()  argument
166 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_timeout()
167 	if (likely(sem->count > 0))  in down_timeout()
168 		sem->count--;  in down_timeout()
170 		result = __down_timeout(sem, timeout);  in down_timeout()
171 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_timeout()
184 void __sched up(struct semaphore *sem)  in up()  argument
189 	raw_spin_lock_irqsave(&sem->lock, flags);  in up()
190 	if (likely(list_empty(&sem->wait_list)))  in up()
191 		sem->count++;  in up()
193 		__up(sem, &wake_q);  in up()
194 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in up()
213 static inline int __sched ___down_common(struct semaphore *sem, long state,  in ___down_common()  argument
218 	list_add_tail(&waiter.list, &sem->wait_list);  in ___down_common()
228 		raw_spin_unlock_irq(&sem->lock);  in ___down_common()
230 		raw_spin_lock_irq(&sem->lock);  in ___down_common()
244 static inline int __sched __down_common(struct semaphore *sem, long state,  in __down_common()  argument
249 	trace_contention_begin(sem, 0);  in __down_common()
250 	ret = ___down_common(sem, state, timeout);  in __down_common()
251 	trace_contention_end(sem, ret);  in __down_common()
256 static noinline void __sched __down(struct semaphore *sem)  in __down()  argument
258 	__down_common(sem, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);  in __down()
261 static noinline int __sched __down_interruptible(struct semaphore *sem)  in __down_interruptible()  argument
263 	return __down_common(sem, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);  in __down_interruptible()
266 static noinline int __sched __down_killable(struct semaphore *sem)  in __down_killable()  argument
268 	return __down_common(sem, TASK_KILLABLE, MAX_SCHEDULE_TIMEOUT);  in __down_killable()
271 static noinline int __sched __down_timeout(struct semaphore *sem, long timeout)  in __down_timeout()  argument
273 	return __down_common(sem, TASK_UNINTERRUPTIBLE, timeout);  in __down_timeout()
276 static noinline void __sched __up(struct semaphore *sem,  in __up()  argument
279 	struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list,  in __up()