linux-kernel - Re: [PATCH 1/2] rust: kbuild: treat `build_error` and `rustdoc` as kernel objects

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Message-ID: <CANiq72=0JJz5XDHGpiyQBd9AmPCr4veJ=2oJywyyqQB8iMxqvA@mail.gmail.com>
Date: Tue, 4 Nov 2025 00:05:45 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Alex Gaynor <alex.gaynor@...il.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, 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>, rust-for-linux@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	patches@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] rust: kbuild: treat `build_error` and `rustdoc` as
 kernel objects

On Sun, Nov 2, 2025 at 10:30 PM Miguel Ojeda <ojeda@...nel.org> wrote:
>
> Even if normally `build_error` isn't a kernel object, it should still
> be treated as such so that we pass the same flags. Similarly, `rustdoc`
> targets are never kernel objects, but we need to treat them as such.
>
> Otherwise, starting with Rust 1.91.0 (released 2025-10-30), `rustc`
> will complain about missing sanitizer flags since `-Zsanitizer` is a
> target modifier too [1]:
>
>     error: mixing `-Zsanitizer` will cause an ABI mismatch in crate `build_error`
>      --> rust/build_error.rs:3:1
>       |
>     3 | //! Build-time error.
>       | ^
>       |
>       = help: the `-Zsanitizer` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
>       = note: unset `-Zsanitizer` in this crate is incompatible with `-Zsanitizer=kernel-address` in dependency `core`
>       = help: set `-Zsanitizer=kernel-address` in this crate or unset `-Zsanitizer` in `core`
>       = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=sanitizer` to silence this error
>
> Thus explicitly mark them as kernel objects.
>
> Cc: stable@...r.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs).
> Link: https://github.com/rust-lang/rust/pull/138736 [1]
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>

Applied series to `rust-fixes` -- thanks everyone!

I will send another less urgent one for 1.92.0 (in beta now) that goes
on top of these here.

Cheers,
Miguel