linux-kernel - Re: [PATCH] x86: rust: set rustc-abi=x86-softfloat on rustc>=1.86.0

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Message-ID: <CANiq72kv_wE_ESNsW9qDiwnJkaoFb+WERJ6p796TCPAdK838Fw@mail.gmail.com>
Date: Thu, 6 Feb 2025 19:51:41 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: x86@...nel.org, rust-for-linux@...r.kernel.org, 
	Miguel Ojeda <ojeda@...nel.org>, 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>, 
	Trevor Gross <tmgross@...ch.edu>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] x86: rust: set rustc-abi=x86-softfloat on rustc>=1.86.0

On Mon, Feb 3, 2025 at 9:41 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> When using Rust on the x86 architecture, we are currently using the
> unstable target.json feature to specify the compilation target. Rustc is
> going to change how softfloat is specified in the target.json file on
> x86, thus update generate_rust_target.rs to specify softfloat using the
> new option.
>
> Note that if you enable this parameter with a compiler that does not
> recognize it, then that triggers a warning but it does not break the
> build.
>
> Cc: stable@...r.kernel.org # for 6.12.y
> Link: https://github.com/rust-lang/rust/pull/136146
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

x86: I will pick this up, but if x86 wants to do so, that would be
welcome -- in which case:

    Acked-by: Miguel Ojeda <ojeda@...nel.org>

and I would recommend updating the Cc stable tag to mention 6.13 and
the reason to avoid over-backports, e.g.

    Cc: <stable@...r.kernel.org> # Needed in 6.12.y and 6.13.y only
(Rust is pinned in older LTSs).

Cheers,
Miguel