linux-kernel - Re: [PATCH 2/7] gpu: nova-core: Add support to convert bitfield to underlying type

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Message-Id: <DDOMXDDVNHSE.1KA62KDD8JOZ3@nvidia.com>
Date: Wed, 22 Oct 2025 15:25:28 +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>,
 "Daniel Almeida" <daniel.almeida@...labora.com>,
 <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH 2/7] gpu: nova-core: Add support to convert bitfield to
 underlying type

On Tue Oct 21, 2025 at 3:55 AM JST, Joel Fernandes wrote:
> To support the usecase where we read a register and write to another
> with identical bit layout, add support to convert bitfield to underlying type.
>
> Another way to do this, is to read individual fields, on the caller
> side, and write to the destination fields, but that is both cumbersome
> and error-prone as new bits added in hardware may be missed.

Shouldn't the title be "Add support to convert bitfield FROM underlying
type"? Since this adds a `From<storage> for Bitfield`.