linux-kernel - [PATCH v2] ASoC: SDCA: Replace use of system_wq with system_dfl

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Message-ID: <20251230143429.179643-1-marco.crivellari@suse.com>
Date: Tue, 30 Dec 2025 15:34:29 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org,
	patches@...nsource.cirrus.com
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>,
	Charles Keepax <ckeepax@...nsource.cirrus.com>,
	Maciej Strozek <mstrozek@...nsource.cirrus.com>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>
Subject: [PATCH v2] ASoC: SDCA: Replace use of system_wq with system_dfl_wq

This patch continues the effort to refactor workqueue APIs, which has begun
with the changes 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")

The point of the refactoring is to eventually alter the default behavior of
workqueues to become unbound by default so that their workload placement is
optimized by the scheduler.

Before that to happen after a careful review and conversion of each individual
case, workqueue users must be converted to the better named new workqueues with
no intended behaviour changes:

   system_wq -> system_percpu_wq
   system_unbound_wq -> system_dfl_wq

This specific workload has no benefits being per-cpu, so system_wq
has been replaced with system_dfl_wq (the unbound workqueue).

This way the old obsolete workqueues (system_wq, system_unbound_wq) can be
removed in the future.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
---
Changes in v2:
- use system_dfl_wq instead of system_percpu_wq because this workload has no
  benefits being per-cpu.

- rebase on v6.19-rc3.

 sound/soc/sdca/sdca_ump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sdca/sdca_ump.c b/sound/soc/sdca/sdca_ump.c
index 8aba3ff16872..a86bb28c6d0a 100644
--- a/sound/soc/sdca/sdca_ump.c
+++ b/sound/soc/sdca/sdca_ump.c
@@ -257,6 +257,6 @@ void sdca_ump_schedule_timeout(struct delayed_work *work, unsigned int timeout_u
 	if (!timeout_us)
 		return;
 
-	queue_delayed_work(system_wq, work, usecs_to_jiffies(timeout_us));
+	queue_delayed_work(system_dfl_wq, work, usecs_to_jiffies(timeout_us));
 }
 EXPORT_SYMBOL_NS_GPL(sdca_ump_schedule_timeout, "SND_SOC_SDCA");
-- 
2.52.0