linux-kernel - Re: [PATCH RFC 1/4] rust: clist: Add abstraction for iterating over C linked lists

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Message-ID: <daf3f3e9-19f8-4055-8964-a3ffba97e1ca@kernel.org>
Date: Tue, 4 Nov 2025 14:49:39 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Joel Fernandes <joelagnelf@...dia.com>, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 David Airlie <airlied@...il.com>, Alistair Popple <apopple@...dia.com>,
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 bjorn3_gh@...tonmail.com, Benno Lossin <lossin@...nel.org>,
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 John Hubbard <jhubbard@...dia.com>, Timur Tabi <ttabi@...dia.com>,
 joel@...lfernandes.org, Elle Rhumsaa <elle@...thered-steel.dev>,
 Daniel Almeida <daniel.almeida@...labora.com>,
 Andrea Righi <arighi@...dia.com>, Philipp Stanner <phasta@...nel.org>,
 nouveau@...ts.freedesktop.org,
 Nouveau <nouveau-bounces@...ts.freedesktop.org>
Subject: Re: [PATCH RFC 1/4] rust: clist: Add abstraction for iterating over C
 linked lists

On 11/1/25 4:51 AM, Alexandre Courbot wrote:
> I am wondering whether `CList` serves an actual purpose beyond providing
> ` CListIter` to iterate on... Would it make sense to merge both types
> into a single one that implements `Iterator`?

I think eventually we will have a bunch of iterator types, e.g for
list_for_each_entry_{safe,reverse,continue}() etc. (see also [1]).

Hence, CList has to provide a couple of methods providing different iterator types.

[1] https://lore.kernel.org/lkml/DDVYV1VT441A.11L5C11F8R7C9@kernel.org/