linux-kernel - Re: [PATCH 3/6] rust: add `bitfield!` macro

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Message-ID: <CANiq72mgmBa8nA695Pxh6mSD5p_RKb+Eek+DPiiRZdvfdQ2ORA@mail.gmail.com>
Date: Tue, 27 Jan 2026 11:55:22 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Yury Norov <ynorov@...dia.com>, Joel Fernandes <joelagnelf@...dia.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <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>, 
	Danilo Krummrich <dakr@...nel.org>, Yury Norov <yury.norov@...il.com>, 
	John Hubbard <jhubbard@...dia.com>, Alistair Popple <apopple@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
	Edwin Peer <epeer@...dia.com>, Eliot Courtney <ecourtney@...dia.com>, 
	Daniel Almeida <daniel.almeida@...labora.com>, Dirk Behme <dirk.behme@...bosch.com>, 
	Steven Price <steven.price@....com>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] rust: add `bitfield!` macro

On Tue, Jan 27, 2026 at 11:41 AM Alexandre Courbot <acourbot@...dia.com> wrote:
>
> The closest we could get would be a macro, that would look like
>
>     bitfield_set!(color, blue, 10);
>
> And beyond the scenes it would call some more intricate (and unsightly)
> machinery. I'd rather define the constraints clearly for users - they
> are not so drastic.

Yeah, our guideline has always been to avoid macros unless really needed.

Cheers,
Miguel