Revert "workqueue: Factor out pwq_is_empty()"

This reverts commit bad184d which is
commit afa87ce upstream.

The workqueue patches backported to 6.6.y caused some reported
regressions, so revert them for now.

Reported-by: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Tejun Heo <tj@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Audra Mitchell <audra@redhat.com>
Link: https://lore.kernel.org/all/ce4c2f67-c298-48a0-87a3-f933d646c73b@leemhuis.info/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/workqueue.c

@@ -1450,11 +1450,6 @@ static void put_pwq_unlocked(struct pool_workqueue *pwq)
 	}
 }
 
-static bool pwq_is_empty(struct pool_workqueue *pwq)
-{
-	return !pwq->nr_active && list_empty(&pwq->inactive_works);
-}
-
 static void pwq_activate_inactive_work(struct work_struct *work)
 {
 	struct pool_workqueue *pwq = get_work_pwq(work);
@@ -3324,7 +3319,7 @@ void drain_workqueue(struct workqueue_struct *wq)
 		bool drained;
 
 		raw_spin_lock_irq(&pwq->pool->lock);
-		drained = pwq_is_empty(pwq);
+		drained = !pwq->nr_active && list_empty(&pwq->inactive_works);
 		raw_spin_unlock_irq(&pwq->pool->lock);
 
 		if (drained)
@@ -4784,7 +4779,7 @@ static bool pwq_busy(struct pool_workqueue *pwq)
 
 	if ((pwq != pwq->wq->dfl_pwq) && (pwq->refcnt > 1))
 		return true;
-	if (!pwq_is_empty(pwq))
+	if (pwq->nr_active || !list_empty(&pwq->inactive_works))
 		return true;
 
 	return false;
@@ -5222,7 +5217,7 @@ void show_one_workqueue(struct workqueue_struct *wq)
 	unsigned long flags;
 
 	for_each_pwq(pwq, wq) {
-		if (!pwq_is_empty(pwq)) {
+		if (pwq->nr_active || !list_empty(&pwq->inactive_works)) {
 			idle = false;
 			break;
 		}
@@ -5234,7 +5229,7 @@ void show_one_workqueue(struct workqueue_struct *wq)
 
 	for_each_pwq(pwq, wq) {
 		raw_spin_lock_irqsave(&pwq->pool->lock, flags);
-		if (!pwq_is_empty(pwq)) {
+		if (pwq->nr_active || !list_empty(&pwq->inactive_works)) {
 			/*
 			 * Defer printing to avoid deadlocks in console
 			 * drivers that queue work while holding locks