linux-kernel - [PATCH v2 0/3] replace uses of system_wq with system_percpu_wq, request alloc

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Message-ID: <20251127144125.233728-1-marco.crivellari@suse.com>
Date: Thu, 27 Nov 2025 15:41:22 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Maximilian Luz <luzmaximilian@...il.com>,
	Hans de Goede <hansg@...nel.org>,
	Ilpo Jarvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 0/3] replace uses of system_wq with system_percpu_wq, request alloc_workqueue to be per-cpu

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