Function task_expire_impl

freebsd/contrib/openzfs/module/os/linux/spl/spl-taskq.c:217–254

* When a delayed task timer expires remove it from the delay list and * add it to the priority list in order for immediate processing. */

 * add it to the priority list in order for immediate processing.
 */
static void
task_expire_impl(taskq_ent_t *t)
{
	taskq_ent_t *w;
	taskq_t *tq = t->tqent_taskq;
	struct list_head *l = NULL;
	unsigned long flags;

	spin_lock_irqsave_nested(&tq->tq_lock, flags, tq->tq_lock_class);

	if (t->tqent_flags & TQENT_FLAG_CANCEL) {
		ASSERT(list_empty(&t->tqent_list));
		spin_unlock_irqrestore(&tq->tq_lock, flags);
		return;
	}

	t->tqent_birth = jiffies;
	DTRACE_PROBE1(taskq_ent__birth, taskq_ent_t *, t);

	/*
	 * The priority list must be maintained in strict task id order
	 * from lowest to highest for lowest_id to be easily calculable.
	 */
	list_del(&t->tqent_list);
	list_for_each_prev(l, &tq->tq_prio_list) {
		w = list_entry(l, taskq_ent_t, tqent_list);
		if (w->tqent_id < t->tqent_id) {
			list_add(&t->tqent_list, l);
			break;
		}
	}
	if (l == &tq->tq_prio_list)
		list_add(&t->tqent_list, &tq->tq_prio_list);

	spin_unlock_irqrestore(&tq->tq_lock, flags);

	wake_up(&tq->tq_work_waitq);
}

static void
task_expire(spl_timer_list_t tl)