linux-kernel - Re: [PATCH v3 5/6] objtool/rust: list `noreturn` Rust functions

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Message-ID: <CANiq72k1OvLEV2uf56vDXGvWX30YWa_r6ewS2fGoqxVGcqf9LQ@mail.gmail.com>
Date: Tue, 6 Aug 2024 23:29:46 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Kees Cook <kees@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	Masahiro Yamada <masahiroy@...nel.org>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, 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@...sung.com>, 
	Alice Ryhl <aliceryhl@...gle.com>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v3 5/6] objtool/rust: list `noreturn` Rust functions

On Tue, Aug 6, 2024 at 10:22 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> So it would be fairly simple to make objtool consume a magic section
> emitted by the compiler.. I think we've asked the compiler folks for
> that at some point even, but I don't have clear recollections.

The section sounds like a good approach -- we will ask the Rust team
about it. Then perhaps we can get Clang/GCC to implement something
similar too -- for this sort of thing we can use the shorter cycles of
`rustc` (and their unstable features concept too) to experiment with
these things :)

I have also added it to our `rustc` sublist of things we need.

Cheers,
Miguel