36 static noinline void __down(struct semaphore *sem);
37 static noinline int __down_interruptible(struct semaphore *sem);
38 static noinline int __down_killable(struct semaphore *sem);
39 static noinline int __down_timeout(struct semaphore *sem, long timeout);
40 static noinline void __up(struct semaphore *sem);
53 void down(struct semaphore *sem)  in down()  argument
57 	raw_spin_lock_irqsave(&sem->lock, flags);  in down()
58 	if (likely(sem->count > 0))  in down()
59 		sem->count--;  in down()
61 		__down(sem);  in down()
62 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down()
75 int down_interruptible(struct semaphore *sem)  in down_interruptible()  argument
80 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_interruptible()
81 	if (likely(sem->count > 0))  in down_interruptible()
82 		sem->count--;  in down_interruptible()
84 		result = __down_interruptible(sem);  in down_interruptible()
85 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_interruptible()
101 int down_killable(struct semaphore *sem)  in down_killable()  argument
106 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_killable()
107 	if (likely(sem->count > 0))  in down_killable()
108 		sem->count--;  in down_killable()
110 		result = __down_killable(sem);  in down_killable()
111 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_killable()
130 int down_trylock(struct semaphore *sem)  in down_trylock()  argument
135 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_trylock()
136 	count = sem->count - 1;  in down_trylock()
138 		sem->count = count;  in down_trylock()
139 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_trylock()
155 int down_timeout(struct semaphore *sem, long timeout)  in down_timeout()  argument
160 	raw_spin_lock_irqsave(&sem->lock, flags);  in down_timeout()
161 	if (likely(sem->count > 0))  in down_timeout()
162 		sem->count--;  in down_timeout()
164 		result = __down_timeout(sem, timeout);  in down_timeout()
165 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in down_timeout()
178 void up(struct semaphore *sem)  in up()  argument
182 	raw_spin_lock_irqsave(&sem->lock, flags);  in up()
183 	if (likely(list_empty(&sem->wait_list)))  in up()
184 		sem->count++;  in up()
186 		__up(sem);  in up()
187 	raw_spin_unlock_irqrestore(&sem->lock, flags);  in up()
204 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()