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

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Message-ID: <7ad70505-d75e-4509-9d88-7906bd65b164@nvidia.com>
Date: Wed, 22 Oct 2025 13:51:09 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: Alexandre Courbot <acourbot@...dia.com>, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 dakr@...nel.org
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 10/22/2025 2:25 AM, Alexandre Courbot wrote:
> 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`.
> 

Good catch, I will fix the title for next posting.

thanks,

 - Joel