linux-kernel - Re: [PATCH v6 0/5] Introduce bitfield and move register macro to rust/kernel/

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Message-Id: <DDDT8EEG7E8B.27YT6QAFIS9GK@kernel.org>
Date: Thu, 09 Oct 2025 15:02:39 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Joel Fernandes" <joelagnelf@...dia.com>
Cc: "Alexandre Courbot" <acourbot@...dia.com>, "Yury Norov"
 <yury.norov@...il.com>, "linux-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>, "rust-for-linux@...r.kernel.org"
 <rust-for-linux@...r.kernel.org>, "dri-devel@...ts.freedesktop.org"
 <dri-devel@...ts.freedesktop.org>, "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" <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" <joel@...lfernandes.org>, "Elle Rhumsaa"
 <elle@...thered-steel.dev>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "Andrea Righi" <arighi@...dia.com>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v6 0/5] Introduce bitfield and move register macro to
 rust/kernel/

On Thu Oct 9, 2025 at 2:24 AM CEST, Joel Fernandes wrote:
> On 10/8/2025 6:23 AM, Danilo Krummrich wrote:
>> On Wed Oct 8, 2025 at 1:37 AM CEST, Joel Fernandes wrote:
>>> The Nvidia GPU architecture is little-endian (including MMU structures in VRAM).
>> 
>> Yes, I'm aware (and I'd assume that there is no reason to ever change that).
>> 
>> Just for the complete picture, there's also some endianness switch in the
>> NV_PMC_BOOT_1 register I think?
>
> You are referring to old GPUs. NV_PMC_BOOT_1 does not have endianness switch for
> Turing and later.

Ok, then there's no point in considering big-endian CPUs.

> If we want to add a Kconfig patch enabling Nova only on x86/ARM, that'll be Ok
> with me.

I don't see why we'd constrain it to x86 and ARM, but we should indeed constrain
it to little-endian architectures.