linux-kernel - Re: [PATCH] rust: add C FFI types to the prelude

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Message-ID: <CANiq72kSsfBm1rKANrxyrcX=X0MvfJZKTYLGU-yRFaMzBTQ2Rw@mail.gmail.com>
Date: Sun, 25 May 2025 23:12:57 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH] rust: add C FFI types to the prelude

On Sun, Apr 13, 2025 at 2:57 AM Miguel Ojeda <ojeda@...nel.org> wrote:
>
> Rust kernel code is supposed to use the custom mapping of C FFI types,
> i.e. those from the `ffi` crate, rather than the ones coming from `core`.
>
> Thus, to minimize mistakes and to simplify the code everywhere, just
> provide them in the `kernel` prelude and ask in the Coding Guidelines
> to use them directly, i.e. as a single segment path.
>
> After this lands, we can start cleaning up the existing users.
>
> Ideally, we would use something like Clippy's `disallowed-types` to
> prevent the use of the `core` ones, but that one sees through aliases.
>
> Link: https://lore.kernel.org/rust-for-linux/CANiq72kc4gzfieD-FjuWfELRDXXD2vLgPv4wqk3nt4pjdPQ=qg@mail.gmail.com/
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>

    [ Reworded content of the documentation to focus on how to use the
      aliases first. - Miguel ]

Cheers,
Miguel