Re: [PATCH] cxl/pci: replace use of system_wq with system_percpu_wq

[Dave Jiang]

On 10/30/25 9:38 AM, Marco Crivellari wrote:
> Currently if a user enqueue 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.
> 
> system_wq should be the per-cpu workqueue, yet in this name nothing makes
> that clear, so replace system_wq with system_percpu_wq.
> 
> The old wq (system_wq) will be kept for a few release cycles.
> 
> Suggested-by: Tejun Heo <tj@xxxxxxxxxx>
> Signed-off-by: Marco Crivellari <marco.crivellari@xxxxxxxx>

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>> ---
>  drivers/cxl/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index bd100ac31672..0be4e508affe 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -136,7 +136,7 @@ static irqreturn_t cxl_pci_mbox_irq(int irq, void *id)
>  	if (opcode == CXL_MBOX_OP_SANITIZE) {
>  		mutex_lock(&cxl_mbox->mbox_mutex);
>  		if (mds->security.sanitize_node)
> -			mod_delayed_work(system_wq, &mds->security.poll_dwork, 0);
> +			mod_delayed_work(system_percpu_wq, &mds->security.poll_dwork, 0);
>  		mutex_unlock(&cxl_mbox->mbox_mutex);
>  	} else {
>  		/* short-circuit the wait in __cxl_pci_mbox_send_cmd() */