Patch "Revert "workqueue: Make wq_adjust_max_active() round-robin pwqs while activating"" has been added to the 6.6-stable tree

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

    Revert "workqueue: Make wq_adjust_max_active() round-robin pwqs while activating"

to the 6.6-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-make-wq_adjust_max_active-round-robin-pwqs-while-activating.patch
and it can be found in the queue-6.6 subdirectory.

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


>From f8b60d9d4e00f518c2674d537b5ec5c9b0a9a336 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 3 Apr 2024 16:36:44 +0200
Subject: Revert "workqueue: Make wq_adjust_max_active() round-robin pwqs while activating"

From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

This reverts commit 5f99fee6f2dea1228980c3e785ab1a2c69b4da3c which is
commit qc5404d4e6df6faba1007544b5f4e62c7c14416dd upstream.

The workqueue patches backported to 6.6.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 |   33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4710,7 +4710,7 @@ static int init_rescuer(struct workqueue
  */
 static void wq_adjust_max_active(struct workqueue_struct *wq)
 {
-	bool activated;
+	struct pool_workqueue *pwq;
 
 	lockdep_assert_held(&wq->mutex);
 
@@ -4730,26 +4730,19 @@ static void wq_adjust_max_active(struct
 	 */
 	WRITE_ONCE(wq->max_active, wq->saved_max_active);
 
-	/*
-	 * Round-robin through pwq's activating the first inactive work item
-	 * until max_active is filled.
-	 */
-	do {
-		struct pool_workqueue *pwq;
+	for_each_pwq(pwq, wq) {
+		unsigned long flags;
+
+		/* this function can be called during early boot w/ irq disabled */
+		raw_spin_lock_irqsave(&pwq->pool->lock, flags);
 
-		activated = false;
-		for_each_pwq(pwq, wq) {
-			unsigned long flags;
-
-			/* can be called during early boot w/ irq disabled */
-			raw_spin_lock_irqsave(&pwq->pool->lock, flags);
-			if (pwq_activate_first_inactive(pwq)) {
-				activated = true;
-				kick_pool(pwq->pool);
-			}
-			raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
-		}
-	} while (activated);
+		while (pwq_activate_first_inactive(pwq))
+			;
+
+		kick_pool(pwq->pool);
+
+		raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
+	}
 }
 
 __printf(1, 4)


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

queue-6.6/revert-workqueue-move-pwq-max_active-to-wq-max_active.patch
queue-6.6/revert-workqueue-replace-pwq_activate_inactive_work-with-pwq_activate_work.patch
queue-6.6/revert-workqueue-implement-system-wide-nr_active-enforcement-for-unbound-workqueues.patch
queue-6.6/revert-workqueue-introduce-struct-wq_node_nr_active.patch
queue-6.6/revert-workqueue-rcu-protect-wq-dfl_pwq-and-implement-accessors-for-it.patch
queue-6.6/revert-workqueue-don-t-call-cpumask_test_cpu-with-1-cpu-in-wq_update_node_max_active.patch
queue-6.6/revert-workqueue-factor-out-pwq_is_empty.patch
queue-6.6/revert-workqueue-shorten-events_freezable_power_efficient-name.patch
queue-6.6/revert-workqueue-make-wq_adjust_max_active-round-robin-pwqs-while-activating.patch
queue-6.6/revert-workqueue.c-increase-workqueue-name-length.patch
queue-6.6/revert-workqueue-move-nr_active-handling-into-helpers.patch




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