linux-kernel - [PATCH] PCI: endpoint: replace use of system_wq with system_percpu

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Message-ID: <20251105151649.256274-1-marco.crivellari@suse.com>
Date: Wed,  5 Nov 2025 16:16:49 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	linux-pci@...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>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Krzysztof Wilczynski <kwilczynski@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>
Subject: [PATCH] PCI: endpoint: 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 same 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/pci/endpoint/pci-ep-cfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index ef50c82e647f..c787ce59d9de 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -638,7 +638,7 @@ static struct config_group *pci_epf_make(struct config_group *group,
 	kfree(epf_name);
 
 	INIT_DELAYED_WORK(&epf_group->cfs_work, pci_epf_cfs_work);
-	queue_delayed_work(system_wq, &epf_group->cfs_work,
+	queue_delayed_work(system_percpu_wq, &epf_group->cfs_work,
 			   msecs_to_jiffies(1));
 
 	return &epf_group->group;
-- 
2.51.1