linux-kernel - [PATCH v3 1/2] rust: add system_dfl() around the new system_dfl

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Message-ID: <20251008151554.340806-2-marco.crivellari@suse.com>
Date: Wed,  8 Oct 2025 17:15:53 +0200
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 v3 1/2] rust: add system_dfl() around the new system_dfl_wq

The C code defines 2 new workqueues: system_percpu_wq and system_dfl_wq,
respectively the futures replacement for system_wq and system_unbound_wq.

This change introduce system_dfl(), that use the new system_dfl_wq.

system_unbound_wq will be replaced in a future release cycle and should
not be used.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
---
 rust/kernel/workqueue.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 706e833e9702..300cc2bfe012 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -968,11 +968,25 @@ pub fn system_long() -> &'static Queue {
 /// Workers are not bound to any specific CPU, not concurrency managed, and all queued work items
 /// are executed immediately as long as `max_active` limit is not reached and resources are
 /// available.
+///
+/// Note: `system_unbound_wq` will be removed in a future release cycle. Use [`system_dfl_wq`] instead.
 pub fn system_unbound() -> &'static Queue {
     // SAFETY: `system_unbound_wq` is a C global, always available.
     unsafe { Queue::from_raw(bindings::system_unbound_wq) }
 }
 
+/// Returns the system unbound work queue (`system_dfl_wq`).
+///
+/// Workers are not bound to any specific CPU, not concurrency managed, and all queued work items
+/// are executed immediately as long as `max_active` limit is not reached and resources are
+/// available.
+///
+/// Note: `system_dfl_wq` will replace in a future release cycle [`system_unbound_wq`].
+pub fn system_dfl() -> &'static Queue {
+    // SAFETY: `system_dfl_wq` is a C global, always available.
+    unsafe { Queue::from_raw(bindings::system_dfl_wq) }
+}
+
 /// Returns the system freezable work queue (`system_freezable_wq`).
 ///
 /// It is equivalent to the one returned by [`system`] except that it's freezable.
-- 
2.51.0