linux-kernel - Re: [PATCH] x86/Kconfig: make CFI_AUTO

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Message-ID: <CANiq72muSS+NNs5fxp4GPKWWhyXT95spvbGsZz6AJnK8RerUqQ@mail.gmail.com>
Date: Wed, 7 May 2025 00:19:11 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Kees Cook <kees@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Paweł Anikiel <panikiel@...gle.com>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Alex Gaynor <alex.gaynor@...il.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	Ingo Molnar <mingo@...hat.com>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Masahiro Yamada <masahiroy@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Nathan Chancellor <nathan@...nel.org>, x86@...nel.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	Matthew Maurer <mmaurer@...gle.com>, Ramon de C Valle <rcvalle@...gle.com>
Subject: Re: [PATCH] x86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST

On Thu, Apr 17, 2025 at 8:40 PM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> Thanks Peter (and Kees for clarifying) -- not sure how you/others
> prefer to route this patch or if you expect a v2, but I got the
> following (attached). I converted your Ack.

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

(If someone else prefers to carry it, please shout)

    [ Rust 1.88.0 (scheduled for 2025-06-26) should have this fixed [1],
      and thus we relaxed the condition with Rust >= 1.88.

      When `objtool` lands checking for this with e.g. [2], the plan is
      to ideally run that in upstream Rust's CI to prevent regressions
      early [3], since we do not control `core`'s source code.

      Alice tested the Rust PR backported to an older compiler.

      Peter would like that Rust provides a stable `core` which can be
      pulled into the kernel: "Relying on that much out of tree code is
      'unfortunate'".

        - Miguel ]

    [ Reduced splat. - Miguel ]

Cheers,
Miguel