linux-kernel - [PATCH RT 4/9] Revert "workqueue: Use local irq lock instead of irq disable regions"

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Date:   Mon, 24 Oct 2022 12:44:20 +0200
From:   Daniel Wagner <wagi@...om.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Clark Williams <williams@...hat.com>,
        Pavel Machek <pavel@...x.de>
Cc:     Daniel Wagner <wagi@...om.org>
Subject: [PATCH RT 4/9] Revert "workqueue: Use local irq lock instead of irq disable regions"

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

v4.19.255-rt114-rc1 stable review patch.
If anyone has any objections, please let me know.

-----------


This reverts the PREEMPT_RT related changes to workqueue. It reverts the
usage of local_locks() and cpu_chill().

This is a preparation to pull in the PREEMPT_RT related changes which
were merged upstream.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
[wagi: 827b6f6962da ("workqueue: rework") already reverted
       most of the changes, except the missing update in
       put_pwq_unlocked.]
Signed-off-by: Daniel Wagner <wagi@...om.org>
---
 kernel/workqueue.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4ed22776b2ee..d97c2ad8dc08 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1496,11 +1496,9 @@ EXPORT_SYMBOL(queue_work_on);
 void delayed_work_timer_fn(struct timer_list *t)
 {
 	struct delayed_work *dwork = from_timer(dwork, t, timer);
-	unsigned long flags;
 
-	local_irq_save(flags);
+	/* should have been called from irqsafe timer with irq already off */
 	__queue_work(dwork->cpu, dwork->wq, &dwork->work);
-	local_irq_restore(flags);
 }
 EXPORT_SYMBOL(delayed_work_timer_fn);
 
-- 
2.38.0