linux-kernel - Re: [PATCH v6 4/5] rust: Move register and bitfield macros out of Nova

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Message-Id: <DDPRDKFEK3H3.2CE3YMXRTLGTI@kernel.org>
Date: Thu, 23 Oct 2025 16:07:21 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Beata Michalska" <beata.michalska@....com>
Cc: "Joel Fernandes" <joelagnelf@...dia.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>, "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" <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>, "Yury Norov" <yury.norov@...il.com>, "Daniel
 Almeida" <daniel.almeida@...labora.com>, "Andrea Righi"
 <arighi@...dia.com>, "nouveau@...ts.freedesktop.org"
 <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v6 4/5] rust: Move register and bitfield macros out of
 Nova

On Thu Oct 23, 2025 at 3:55 PM CEST, Beata Michalska wrote:
> I guess everything that would use IoRequest::iomap(self), which generates
> Io<SIZE=0> which is a game over for the macro.

To be honest, we may just want to remove this API. A driver that requires a zero
sized MMIO region with only optional runtime derived access offsets seems a bit
too exotic.

That doesn't mean that occasionally we'll have drivers needing runtime offsets,
so eventually we want to support that with the register!() macro, but it's not
*that* urgent.