linux-kernel - [PATCH] regulator: irq_helper: replace use of system_wq with system_percpu

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Message-ID: <20251105161425.308499-1-marco.crivellari@suse.com>
Date: Wed,  5 Nov 2025 17:14:25 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH] regulator: irq_helper: replace use of system_wq with system_percpu_wq

Currently if a user enqueues a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.

This lack of consistency cannot be addressed without refactoring the API.

This patch continues the effort to refactor worqueue APIs, which has begun
with the change introducing new workqueues and a new alloc_workqueue flag:

commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

Replace system_wq with system_percpu_wq, keeping the old behavior.
The old wq (system_wq) will be kept for a few release cycles.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
---
 drivers/regulator/irq_helpers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/irq_helpers.c b/drivers/regulator/irq_helpers.c
index 5742faee8071..54dd19e1e94c 100644
--- a/drivers/regulator/irq_helpers.c
+++ b/drivers/regulator/irq_helpers.c
@@ -146,7 +146,7 @@ static void regulator_notifier_isr_work(struct work_struct *work)

 reschedule:
 	if (!d->high_prio)
-		mod_delayed_work(system_wq, &h->isr_work,
+		mod_delayed_work(system_percpu_wq, &h->isr_work,
 				 msecs_to_jiffies(tmo));
 	else
 		mod_delayed_work(system_highpri_wq, &h->isr_work,
-- 
2.51.1