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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/kernel/sched/swait.c
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@@ -32,6 +32,19 @@
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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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+	while (!list_empty(&q->task_list))
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+		swake_up_locked(q);
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+}
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+
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 void swake_up_one(struct swait_queue_head *q)
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 {
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 	unsigned long flags;
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@@ -51,6 +64,7 @@
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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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@@ -69,7 +83,7 @@
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 }
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 EXPORT_SYMBOL(swake_up_all);
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-static void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
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+void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
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 {
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 	wait->task = current;
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 	if (list_empty(&wait->task_list))
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@@ -93,7 +107,7 @@
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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.