replace uses of system_wq with system_percpu_wq, request alloc_workqueue to be per-cpu

[PATCH v2 0/3] replace uses of system_wq with system_percpu_wq, request alloc_workqueue to be per-cpu

Posted by Marco Crivellari 4 days, 6 hours ago

Hi,

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")

More information can be found at the link below:

	https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/

=== Changes introduced by this series ===

1) [P 1] Request alloc_workqueue() to be per-cpu if WQ_UNBOUND is not present

	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.

2) [P 2-3] 

	Workqueue users must be converted to the better named new workqueues with
	no intended behaviour changes:

   		system_wq -> system_percpu_wq
   		system_unbound_wq -> system_dfl_wq

	This way the old obsolete workqueues (system_wq, system_unbound_wq) can be
	removed in the future.


Thanks!

---
Changes in v2:
- Patches grouped in 1 single series

- commit logs improved


Marco Crivellari (3):
  platform/surface: acpi-notify: add WQ_PERCPU to alloc_workqueue users
  platform: x86: replace use of system_wq with system_percpu_wq
  platform: surface: replace use of system_wq with system_percpu_wq

 drivers/platform/surface/aggregator/ssh_packet_layer.c     | 2 +-
 drivers/platform/surface/aggregator/ssh_request_layer.c    | 2 +-
 drivers/platform/surface/surface_acpi_notify.c             | 2 +-
 drivers/platform/x86/gpd-pocket-fan.c                      | 4 ++--
 drivers/platform/x86/x86-android-tablets/vexia_atla10_ec.c | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

-- 
2.51.1

Re: [PATCH v2 0/3] replace uses of system_wq with system_percpu_wq, request alloc_workqueue to be per-cpu

Posted by Ilpo Järvinen 3 days, 11 hours ago

On Thu, 27 Nov 2025 15:41:22 +0100, Marco Crivellari 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")
> 
> More information can be found at the link below:
> 
> [...]


Thank you for your contribution, it has been applied to my local
review-ilpo-next branch. Note it will show up in the public
platform-drivers-x86/review-ilpo-next branch only once I've pushed my
local branch there, which might take a while.

The list of commits applied:
[1/3] platform/surface: acpi-notify: add WQ_PERCPU to alloc_workqueue users
      commit: f03dd5dd736d6aea94406a273be2a10f84bc60e1
[2/3] platform: x86: replace use of system_wq with system_percpu_wq
      commit: db4399501c58ad1225105224e7c9f03bc3d4fe39
[3/3] platform: surface: replace use of system_wq with system_percpu_wq
      commit: f720239ca39d72657e1bbf9c4c6270c78f548e43

--
 i.

Re: [PATCH v2 0/3] replace uses of system_wq with system_percpu_wq, request alloc_workqueue to be per-cpu

Posted by Marco Crivellari 3 days, 5 hours ago

On Fri, Nov 28, 2025 at 11:25 AM Ilpo Järvinen
<ilpo.jarvinen@linux.intel.com> wrote:
> [...]
> Thank you for your contribution, it has been applied to my local
> review-ilpo-next branch. Note it will show up in the public
> platform-drivers-x86/review-ilpo-next branch only once I've pushed my
> local branch there, which might take a while.
>
> The list of commits applied:
> [1/3] platform/surface: acpi-notify: add WQ_PERCPU to alloc_workqueue users
>       commit: f03dd5dd736d6aea94406a273be2a10f84bc60e1
> [2/3] platform: x86: replace use of system_wq with system_percpu_wq
>       commit: db4399501c58ad1225105224e7c9f03bc3d4fe39
> [3/3] platform: surface: replace use of system_wq with system_percpu_wq
>       commit: f720239ca39d72657e1bbf9c4c6270c78f548e43

Many thanks!

-- 

Marco Crivellari

L3 Support Engineer, Technology & Product