linux-kernel - [PATCH v2 0/3] Replace wq users and add WQ_PERCPU to alloc

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Message-ID: <20260113114630.152942-1-marco.crivellari@suse.com>
Date: Tue, 13 Jan 2026 12:46:27 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.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>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 0/3] Replace wq users and add WQ_PERCPU to alloc_workqueue() users

Hi,

This series continues the effort to refactor the Workqueue API.
No behavior changes are introduced by this series.

=== Recent changes to the WQ API ===

The following, address the recent changes in the Workqueue API:

- commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
- commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

The old workqueues will be removed in a future release cycle and
unbound will become the implicit default.

=== Introduced Changes by this series ===

1) [P 1-2] Replace use of system_wq and system_unbound_wq

    Workqueue users converted to the better named new workqueues:

        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.

2) [P 3] add WQ_PERCPU to remaining alloc_workqueue() users

    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.

    WQ_UNBOUND will be removed in future.


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


---
Changes in v2:
- commit logs upgraded with a better description
- rebased on 6.19-rc5

Marco Crivellari (3):
  mm: Replace use of system_unbound_wq with system_dfl_wq
  mm: Replace use of system_wq with system_percpu_wq
  mm: add WQ_PERCPU to alloc_workqueue users

 mm/backing-dev.c | 6 +++---
 mm/kfence/core.c | 6 +++---
 mm/memcontrol.c  | 4 ++--
 mm/slub.c        | 4 +++-
 mm/vmstat.c      | 3 ++-
 5 files changed, 13 insertions(+), 10 deletions(-)

-- 
2.52.0