Re: [PATCH 1/2] drm/nouveau: replace use of system_unbound_wq with system_dfl_wq

[Thomas Zimmermann <tzimmermann@suse.de>]

Am 31.10.25 um 11:20 schrieb Marco Crivellari:
> 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_unbound_wq should be the default workqueue so as not to enforce
> locality constraints for random work whenever it's not required.
>
> Adding system_dfl_wq to encourage its use when unbound work should be used.
>
> The old system_unbound_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>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/gpu/drm/nouveau/dispnv50/disp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> index e97e39abf3a2..50b7aade5f0a 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> @@ -2474,7 +2474,7 @@ nv50_disp_atomic_commit(struct drm_device *dev,
>   	pm_runtime_get_noresume(dev->dev);
>   
>   	if (nonblock)
> -		queue_work(system_unbound_wq, &state->commit_work);
> +		queue_work(system_dfl_wq, &state->commit_work);
>   	else
>   		nv50_disp_atomic_commit_tail(state);
>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)