Add wait_event_killable

	__ret;								\

})

#define __wait_event_killable(wq, condition, ret)			\

do {									\

	DEFINE_WAIT(__wait);						\

									\

	for (;;) {							\

		prepare_to_wait(&wq, &__wait, TASK_KILLABLE);		\

		if (condition)						\

			break;						\

		if (!fatal_signal_pending(current)) {			\

			schedule();					\

			continue;					\

		}							\

		ret = -ERESTARTSYS;					\

		break;							\

	}								\

	finish_wait(&wq, &__wait);					\

} while (0)

/**

 * wait_event_killable - sleep until a condition gets true

 * @wq: the waitqueue to wait on

 * @condition: a C expression for the event to wait for

 *

 * The process is put to sleep (TASK_KILLABLE) until the

 * @condition evaluates to true or a 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.

 *

 * The function will return -ERESTARTSYS if it was interrupted by a

 * signal and 0 if @condition evaluated to true.

 */

#define wait_event_killable(wq, condition)				\

({									\

	int __ret = 0;							\

	if (!(condition))						\

		__wait_event_killable(wq, condition, __ret);		\

	__ret;								\

})

/*

 * Must be called with the spinlock in the wait_queue_head_t held.

 */