linux-kernel - [PATCH v5 0/2] Add new workqueue wrapper and enqueue on cpu functions

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Message-ID: <20260204155037.325482-1-marco.crivellari@suse.com>
Date: Wed,  4 Feb 2026 16:50:35 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...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>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH v5 0/2] Add new workqueue wrapper and enqueue on cpu functions

Hi,

Recently the workqueue code has been changed introducing two new workqueue,
system_percpu_wq and system_dfl_wq, as a future replacement for system_wq and
system_unbound_wq respectively.

The change has been introduced by:
    'commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")'

The old workqueue(s) will be removed in a next release cycle.

=== Introduced Changes by this series ===

1) [P 1] Add wrapper for the new system_dfl_wq
  -   This change introduce two new Rust functions in order to add a wrapper for
      the new wq(s) defined in the C code.

2) [P 2] Add wrapper for system_percpu_wq and two new functions
  -   The new functions added are enqueue_cpu() and enqueue_delayed_cpu() and
      are accepting a u32 parameter, the id of the CPU on which the work should
      be scheduled on.


Thanks!

---
Changes in v5:
- system_dfl() renamed to system_default()

- Cover letter v4:
  https://lore.kernel.org/all/20260203152818.317806-1-marco.crivellari@suse.com/

Changes in v4:
- two new function added in the Queue implementation:
  * enqueue_cpu()
  * enqueue_delayed_cpu()

  These functions receive a u32 CPU id in order to schedule work on that CPU.

  More info can be found in the v3 discussion:
  https://lore.kernel.org/all/CAAofZF6jcCAdDjRp-7w7+_ZgOG4k3apxbSiKvGoUDVf5hw0GhA@mail.gmail.com/

Changes in v3:
- added a proper comment documenting the new added functions.

Changes in v2:
- added system_percpu() and system_dfl() in order to use the new
  wq defined in the C code.

- fixed misleading paragraph in the commit log (no warnings are currently
  present).

Marco Crivellari (2):
  rust: add system_default() around the new system_dfl_wq
  rust: add system_percpu() and per-cpu enqueue functions

 rust/kernel/sync/completion.rs |   2 +-
 rust/kernel/workqueue.rs       | 110 +++++++++++++++++++++++++++++++--
 2 files changed, 105 insertions(+), 7 deletions(-)

-- 
2.52.0