linux-kernel - Re: [PATCH v5 0/9] Introduce bitfield and move register macro to rust/kernel/

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Message-Id: <DD7G0ERRKG3K.1AFE4FSLNBZCX@nvidia.com>
Date: Thu, 02 Oct 2025 10:24:59 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Joel Fernandes" <joelagnelf@...dia.com>,
 <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>,
 <dri-devel@...ts.freedesktop.org>, <dakr@...nel.org>, <acourbot@...dia.com>
Cc: "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>, "David Airlie" <airlied@...il.com>,
 "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>, "Yury
 Norov" <yury.norov@...il.com>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "Andrea Righi" <arighi@...dia.com>,
 <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v5 0/9] Introduce bitfield and move register macro to
 rust/kernel/

On Tue Sep 30, 2025 at 11:45 PM JST, Joel Fernandes wrote:
> Hello!
>
> These patches extract and enhance the bitfield support in the register macro in
> nova to define Rust structures with bitfields. It then moves out the bitfield
> support into the kenrel crate and further enhances it. This is extremely useful
> as it allows clean Rust structure definitions without requiring explicit masks
> and shifts.

The extraction and move in themselves (patches 1-4 and maybe the KUNIT
one) look good to me. For the remainder, it will depend on whether the
BoundedInt idea sticks or not as it changes the design in a way that
makes most of these patches unneeded. In any case I think this can be
worked on after the split and extraction.

Patch 5 should probably be dropped as it has the potential to clear
register fields that are useful to the hardware but have no entry in the
`register!` definition, making read-update-write updates of registers
unpredictable.