linux-kernel - Re: [PATCH v3] rust: clist: Add support to interface with C linked lists

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Message-ID: <ddc0c618-095d-417d-a52a-4294d692022d@nvidia.com>
Date: Mon, 1 Dec 2025 14:54:43 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Joel Fernandes <joelagnelf@...dia.com>, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 nouveau@...ts.freedesktop.org, Danilo Krummrich <dakr@...nel.org>,
 Dave Airlie <airlied@...il.com>, Alexandre Courbot <acourbot@...dia.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>,
 Timur Tabi <ttabi@...dia.com>, Joel Fernandes <joel@...lfernandes.org>,
 Lyude Paul <elle@...thered-steel.dev>,
 Daniel Almeida <daniel.almeida@...labora.com>,
 Andrea Righi <arighi@...dia.com>, Philipp Stanner <phasta@...nel.org>
Subject: Re: [PATCH v3] rust: clist: Add support to interface with C linked
 lists

On 12/1/25 2:50 PM, Miguel Ojeda wrote:
> On Mon, Dec 1, 2025 at 11:18 PM John Hubbard <jhubbard@...dia.com> wrote:
>>
>> But for API developers, the problem with doctests is that no one has ever
>> actually *run* the code. It's just a build test. And so critical bugs, such
>> as the kernel crash/hang below, are missed.
> 
> No, it is not just a build test. Doctests are actually transformed
> into KUnit tests automatically, and `assert!`s inside them actually
> report back to KUnit too.

I somehow failed to really internalize the connection to KUnit (or
to even remember it). Joel pointed it out too.

> 
> It was a major hack to implement, but I am proud of that one :)
> 
> That also allows us to build them with Clippy, to e.g. get the safety
> comments right, which is something normal Rust doesn't support yet.
> 
> We are actually getting a feature from upstream Rust to support it all
> in a stable and nice way!
> 



thanks,
-- 
John Hubbard