Re: [PATCH v3] thermal: core: Add WQ_UNBOUND to alloc_workqueue users

[Rafael J. Wysocki]

On Fri, May 15, 2026 at 10:49 AM Marco Crivellari
<marco.crivellari@xxxxxxxx> wrote:
>
> This continues the effort to refactor workqueue APIs, which began with
> the introduction of new workqueues and a new alloc_workqueue flag in:
>
>    commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
>    commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")
>
> The refactoring is going to alter the default behavior of
> alloc_workqueue() to be unbound by default.
>
> With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND),
> any alloc_workqueue() caller that doesn’t explicitly specify WQ_UNBOUND
> must now use WQ_PERCPU. For more details see the Link tag below.
>
> This workqueue has no benefits being per-CPU, so make it unbound adding
> WQ_UNBOUND, removing also the WQ_POWER_EFFICIENT flag.
>
> Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@xxxxxxxxxxxxx/
> Suggested-by: Tejun Heo <tj@xxxxxxxxxx>
> Signed-off-by: Marco Crivellari <marco.crivellari@xxxxxxxx>
> ---
> Changes in v3:
> - remove WQ_POWER_EFFICIENT: the workqueue has more benetifs being unbound,
>   so just drop this flag and keep only WQ_UNBOUND.
>
> Link to v2: https://lore.kernel.org/all/20260514142511.325446-1-marco.crivellari@xxxxxxxx/
>
> Changes in v2:
> - "thermal_events" workqueue has more benefits being unbound, so instead
>   of WQ_PERCPU, use WQ_UNBOUND.
>
> Link to v1: https://lore.kernel.org/all/20260514132901.275477-1-marco.crivellari@xxxxxxxx/
>
>  drivers/thermal/thermal_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 2f4e2dc46b8f..0b322473deac 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1889,7 +1889,7 @@ static int __init thermal_init(void)
>         if (result)
>                 goto error;
>
> -       thermal_wq = alloc_workqueue("thermal_events", WQ_POWER_EFFICIENT, 0);
> +       thermal_wq = alloc_workqueue("thermal_events", WQ_UNBOUND, 0);
>         if (!thermal_wq) {
>                 result = -ENOMEM;
>                 goto unregister_netlink;
> --

Applied as 7.2 material, thanks!