linux-kernel - Re: [PATCH] workqueue: rust: add creation of workqueues

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Message-ID: <Z_1QzTdV8mHJYdQ6@cassiopeiae>
Date: Mon, 14 Apr 2025 20:15:41 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Tejun Heo <tj@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Tamir Duberstein <tamird@...il.com>, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: rust: add creation of workqueues

On Fri, Apr 11, 2025 at 03:34:24PM +0000, Alice Ryhl wrote:
> 
> +/// An owned kernel work queue.

I'd suggest to document that dropping an OwnedQueue will wait for pending work.

Additionally, given that you're about to implement delayed work as well, we
should also mention that destroy_workqueue() currently does not cover waiting
for delayed work *before* it is scheduled and hence may cause WARN() splats or
even UAF bugs.

> +///
> +/// # Invariants
> +///
> +/// `queue` points at a valid workqueue that is owned by this `OwnedQueue`.
> +pub struct OwnedQueue {
> +    queue: NonNull<Queue>,
> +}