Patch "Revert "workqueue: Factor out pwq_is_empty()"" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    Revert "workqueue: Factor out pwq_is_empty()"

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-workqueue-factor-out-pwq_is_empty.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 71a2e79b9a53efb703033e61a264003b3ea85840 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 3 Apr 2024 16:29:23 +0200
Subject: Revert "workqueue: Factor out pwq_is_empty()"

From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

This reverts commit 70abdc2f6c906ffea699f6e0e08fcbd9437e6bcc which is commit
afa87ce85379e2d93863fce595afdb5771a84004 upstream.

The workqueue patches backported to 6.8.y caused some reported
regressions, so revert them for now.

Reported-by: Thorsten Leemhuis <regressions@xxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Sasha Levin <sashal@xxxxxxxxxx>
Cc: Audra Mitchell <audra@xxxxxxxxxx>
Link: https://lore.kernel.org/all/ce4c2f67-c298-48a0-87a3-f933d646c73b@xxxxxxxxxxxxx/
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 kernel/workqueue.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1456,11 +1456,6 @@ static void put_pwq_unlocked(struct pool
 	}
 }
 
-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);
@@ -3330,7 +3325,7 @@ reflush:
 		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)
@@ -4777,7 +4772,7 @@ static bool pwq_busy(struct pool_workque
 
 	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;
@@ -5215,7 +5210,7 @@ void show_one_workqueue(struct workqueue
 	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;
 		}
@@ -5227,7 +5222,7 @@ void show_one_workqueue(struct workqueue
 
 	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


Patches currently in stable-queue which might be from gregkh@xxxxxxxxxxxxxxxxxxx are

queue-6.8/revert-workqueue-move-pwq-max_active-to-wq-max_active.patch
queue-6.8/revert-workqueue-replace-pwq_activate_inactive_work-with-pwq_activate_work.patch
queue-6.8/revert-workqueue-implement-system-wide-nr_active-enforcement-for-unbound-workqueues.patch
queue-6.8/revert-workqueue-introduce-struct-wq_node_nr_active.patch
queue-6.8/revert-workqueue-rcu-protect-wq-dfl_pwq-and-implement-accessors-for-it.patch
queue-6.8/revert-workqueue-don-t-call-cpumask_test_cpu-with-1-cpu-in-wq_update_node_max_active.patch
queue-6.8/revert-workqueue-factor-out-pwq_is_empty.patch
queue-6.8/revert-workqueue-shorten-events_freezable_power_efficient-name.patch
queue-6.8/revert-workqueue-make-wq_adjust_max_active-round-robin-pwqs-while-activating.patch
queue-6.8/revert-workqueue.c-increase-workqueue-name-length.patch
queue-6.8/revert-workqueue-move-nr_active-handling-into-helpers.patch




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