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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/kernel/sched/swait.c
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@@ -32,24 +32,18 @@
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 }
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 EXPORT_SYMBOL(swake_up_locked);
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+/*
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+ * Wake up all waiters. This is an interface which is solely exposed for
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+ * completions and not for general usage.
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+ *
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+ * It is intentionally different from swake_up_all() to allow usage from
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+ * hard interrupt context and interrupt disabled regions.
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+ */
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 void swake_up_all_locked(struct swait_queue_head *q)
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 {
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-	struct swait_queue *curr;
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-	int wakes = 0;
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-
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-	while (!list_empty(&q->task_list)) {
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-
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-		curr = list_first_entry(&q->task_list, typeof(*curr),
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-					task_list);
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-		wake_up_process(curr->task);
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-		list_del_init(&curr->task_list);
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-		wakes++;
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-	}
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-	if (pm_in_action)
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-		return;
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-	WARN(wakes > 2, "complete_all() with %d waiters\n", wakes);
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+	while (!list_empty(&q->task_list))
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+		swake_up_locked(q);
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 }
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-EXPORT_SYMBOL(swake_up_all_locked);
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 void swake_up_one(struct swait_queue_head *q)
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 {
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@@ -70,7 +64,6 @@
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 	struct swait_queue *curr;
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 	LIST_HEAD(tmp);
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-	WARN_ON(irqs_disabled());
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 	raw_spin_lock_irq(&q->lock);
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 	list_splice_init(&q->task_list, &tmp);
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 	while (!list_empty(&tmp)) {
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@@ -113,7 +106,7 @@
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 	long ret = 0;
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 	raw_spin_lock_irqsave(&q->lock, flags);
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-	if (unlikely(signal_pending_state(state, current))) {
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+	if (signal_pending_state(state, current)) {
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 		/*
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 		 * See prepare_to_wait_event(). TL;DR, subsequent swake_up_one()
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 		 * must not see us.