Merge tag 'v3.10.13' into lsk/v3.10/topic/kvm

[firefly-linux-kernel-4.4.55.git] / include / linux / wait.h

diff --git a/include/linux/wait.h b/include/linux/wait.h
index 1133695eb0671d7aeb7f9140bf2b6adc3bc7483d..c8e5760222342669081979e1ed36623dedde59ff 100644 (file)
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -805,6 +805,63 @@ do {                                                                       \
        __ret;                                                          \
 })
 
+#define __wait_event_interruptible_lock_irq_timeout(wq, condition,     \
+                                                   lock, ret)          \
+do {                                                                   \
+       DEFINE_WAIT(__wait);                                            \
+                                                                       \
+       for (;;) {                                                      \
+               prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);      \
+               if (condition)                                          \
+                       break;                                          \
+               if (signal_pending(current)) {                          \
+                       ret = -ERESTARTSYS;                             \
+                       break;                                          \
+               }                                                       \
+               spin_unlock_irq(&lock);                                 \
+               ret = schedule_timeout(ret);                            \
+               spin_lock_irq(&lock);                                   \
+               if (!ret)                                               \
+                       break;                                          \
+       }                                                               \
+       finish_wait(&wq, &__wait);                                      \
+} while (0)
+
+/**
+ * wait_event_interruptible_lock_irq_timeout - sleep until a condition gets true or a timeout elapses.
+ *             The condition is checked under the lock. This is expected
+ *             to be called with the lock taken.
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @lock: a locked spinlock_t, which will be released before schedule()
+ *       and reacquired afterwards.
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_INTERRUPTIBLE) until the
+ * @condition evaluates to true or signal is received. The @condition is
+ * checked each time the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * This is supposed to be called while holding the lock. The lock is
+ * dropped before going to sleep and is reacquired afterwards.
+ *
+ * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
+ * was interrupted by a signal, and the remaining jiffies otherwise
+ * if the condition evaluated to true before the timeout elapsed.
+ */
+#define wait_event_interruptible_lock_irq_timeout(wq, condition, lock, \
+                                                 timeout)              \
+({                                                                     \
+       int __ret = timeout;                                            \
+                                                                       \
+       if (!(condition))                                               \
+               __wait_event_interruptible_lock_irq_timeout(            \
+                                       wq, condition, lock, __ret);    \
+       __ret;                                                          \
+})
+
 
 /*
  * These are the old interfaces to sleep waiting for an event.