struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
{
	struct rb_node *leftmost = rb_first_cached(&head->rb_root);

	return rb_entry(leftmost, struct timerqueue_node, node);
}
struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
{
	struct rb_node *leftmost = rb_first_cached(&head->rb_root);

	return rb_entry(leftmost, struct timerqueue_node, node);
}