[PATCH] PCI: endpoint: replace use of system_wq with system_percpu_wq

[PATCH] PCI: endpoint: replace use of system_wq with system_percpu_wq

[Marco Crivellari]

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@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.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

Re: [PATCH] PCI: endpoint: replace use of system_wq with system_percpu_wq

[Marco Crivellari]

On Wed, Nov 5, 2025 at 4:16 PM Marco Crivellari
<marco.crivellari@suse.com> wrote:
> [...]
>  drivers/pci/endpoint/pci-ep-cfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Gentle ping.

Many thanks!

-- 

Marco Crivellari

L3 Support Engineer