fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-arm / semaphore-helper.h
blob1d7f1987edb96abca7fac4532463f9fce0bf688e
1 #ifndef ASMARM_SEMAPHORE_HELPER_H
2 #define ASMARM_SEMAPHORE_HELPER_H
4 /*
5 * These two _must_ execute atomically wrt each other.
6 */
7 static inline void wake_one_more(struct semaphore * sem)
9 unsigned long flags;
11 spin_lock_irqsave(&semaphore_wake_lock, flags);
12 if (atomic_read(&sem->count) <= 0)
13 sem->waking++;
14 spin_unlock_irqrestore(&semaphore_wake_lock, flags);
17 static inline int waking_non_zero(struct semaphore *sem)
19 unsigned long flags;
20 int ret = 0;
22 spin_lock_irqsave(&semaphore_wake_lock, flags);
23 if (sem->waking > 0) {
24 sem->waking--;
25 ret = 1;
27 spin_unlock_irqrestore(&semaphore_wake_lock, flags);
28 return ret;
32 * waking non zero interruptible
33 * 1 got the lock
34 * 0 go to sleep
35 * -EINTR interrupted
37 * We must undo the sem->count down_interruptible() increment while we are
38 * protected by the spinlock in order to make this atomic_inc() with the
39 * atomic_read() in wake_one_more(), otherwise we can race. -arca
41 static inline int waking_non_zero_interruptible(struct semaphore *sem,
42 struct task_struct *tsk)
44 unsigned long flags;
45 int ret = 0;
47 spin_lock_irqsave(&semaphore_wake_lock, flags);
48 if (sem->waking > 0) {
49 sem->waking--;
50 ret = 1;
51 } else if (signal_pending(tsk)) {
52 atomic_inc(&sem->count);
53 ret = -EINTR;
55 spin_unlock_irqrestore(&semaphore_wake_lock, flags);
56 return ret;
60 * waking_non_zero_try_lock:
61 * 1 failed to lock
62 * 0 got the lock
64 * We must undo the sem->count down_interruptible() increment while we are
65 * protected by the spinlock in order to make this atomic_inc() with the
66 * atomic_read() in wake_one_more(), otherwise we can race. -arca
68 static inline int waking_non_zero_trylock(struct semaphore *sem)
70 unsigned long flags;
71 int ret = 1;
73 spin_lock_irqsave(&semaphore_wake_lock, flags);
74 if (sem->waking <= 0)
75 atomic_inc(&sem->count);
76 else {
77 sem->waking--;
78 ret = 0;
80 spin_unlock_irqrestore(&semaphore_wake_lock, flags);
81 return ret;
84 #endif