37 static noinline void __down(struct semaphore *sem);
38 static noinline int __down_interruptible(struct semaphore *sem);
39 static noinline int __down_killable(struct semaphore *sem);
40 static noinline int __down_timeout(struct semaphore *sem, long timeout);
41 static noinline void __up(struct semaphore *sem);
54 void down(struct semaphore *sem)  in down()  argument
58 	raw_spin_lock_irqsave(&sem->lock, flags);  in down()
59 	if (likely(sem->count > 0))  in down()
60 		sem->count--;  in down()
62 		__down(sem);  in down()
63 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down()
76 int down_interruptible(struct semaphore *sem)  in down_interruptible()  argument
81 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_interruptible()
82 	if (likely(sem->count > 0))  in down_interruptible()
83 		sem->count--;  in down_interruptible()
85 		result = __down_interruptible(sem);  in down_interruptible()
86 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_interruptible()
102 int down_killable(struct semaphore *sem)  in down_killable()  argument
107 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_killable()
108 	if (likely(sem->count > 0))  in down_killable()
109 		sem->count--;  in down_killable()
111 		result = __down_killable(sem);  in down_killable()
112 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_killable()
131 int down_trylock(struct semaphore *sem)  in down_trylock()  argument
136 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_trylock()
137 	count = sem->count - 1;  in down_trylock()
139 		sem->count = count;  in down_trylock()
140 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_trylock()
156 int down_timeout(struct semaphore *sem, long timeout)  in down_timeout()  argument
161 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_timeout()
162 	if (likely(sem->count > 0))  in down_timeout()
163 		sem->count--;  in down_timeout()
165 		result = __down_timeout(sem, timeout);  in down_timeout()
166 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_timeout()
179 void up(struct semaphore *sem)  in up()  argument
183 	raw_spin_lock_irqsave(&sem->lock, flags);  in up()
184 	if (likely(list_empty(&sem->wait_list)))  in up()
185 		sem->count++;  in up()
187 		__up(sem);  in up()
188 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in up()
205 static inline int __sched __down_common(struct semaphore *sem, long state,  in __down_common()  argument
210 	list_add_tail(&waiter.list, &sem->wait_list);  in __down_common()
220 		raw_spin_unlock_irq(&sem->lock);  in __down_common()
222 		raw_spin_lock_irq(&sem->lock);  in __down_common()
236 static noinline void __sched __down(struct semaphore *sem)  in __down()  argument
238 	__down_common(sem, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);  in __down()
241 static noinline int __sched __down_interruptible(struct semaphore *sem)  in __down_interruptible()  argument
243 	return __down_common(sem, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);  in __down_interruptible()
246 static noinline int __sched __down_killable(struct semaphore *sem)  in __down_killable()  argument
248 	return __down_common(sem, TASK_KILLABLE, MAX_SCHEDULE_TIMEOUT);  in __down_killable()
251 static noinline int __sched __down_timeout(struct semaphore *sem, long timeout)  in __down_timeout()  argument
253 	return __down_common(sem, TASK_UNINTERRUPTIBLE, timeout);  in __down_timeout()
256 static noinline void __sched __up(struct semaphore *sem)  in __up()  argument
258 	struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list,  in __up()