linux-kernel - Re: [PATCH] x86/Kconfig: rust: Patchable function Rust compat

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Message-ID: <CANiq72nrCThY3mtHRMncRFDsu8XUmdb=W4WBs5Ua6oNugkDZhA@mail.gmail.com>
Date:   Mon, 11 Dec 2023 16:35:51 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Matthew Maurer <mmaurer@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        "H. Peter Anvin" <hpa@...or.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>,
        linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] x86/Kconfig: rust: Patchable function Rust compat

On Mon, Dec 11, 2023 at 4:08 PM Matthew Maurer <mmaurer@...gle.com> wrote:
>
> +       def_bool $(rs-option,-Zpatchable-function-entry=16,16)

We don't have `rs-option` in mainline yet -- missing dependency? We
will likely eventually need it, but currently we only support a single
Rust version anyway, so we could add it (and the flag check itself)
when we upgrade (especially if it is going to be supported soon).

Speaking of which, I can't find the flag in upstream Rust (i.e.
outside the LLVM submodule), and I couldn't find a PR adding it. Could
you please add a `Link:` tag to the tracking issue / PR / ... if it is
submitted / when it is submitted? Or am I very confused?

Cheers,
Miguel