linux-kernel - Re: [PATCH v5 1/2] rust: add system_default() around the new system_dfl

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Message-ID: <aYNxkG3gCspeeW9_@google.com>
Date: Wed, 4 Feb 2026 16:19:28 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Marco Crivellari <marco.crivellari@...e.com>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>, 
	Frederic Weisbecker <frederic@...nel.org>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	Michal Hocko <mhocko@...e.com>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>
Subject: Re: [PATCH v5 1/2] rust: add system_default() around the new system_dfl_wq

On Wed, Feb 04, 2026 at 04:50:36PM +0100, Marco Crivellari wrote:
> 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_default(), 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..adbecdb2b3a9 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_default() -> &'static Queue {
> +    // SAFETY: `system_dfl_wq` is a C global, always available.
> +    unsafe { Queue::from_raw(bindings::system_dfl_wq) }

I don't think we should use different naming than C.

Alice