linux-kernel - Re: [PATCH] arch: um: rust: Use the generated target.json again

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Date: Wed, 12 Jun 2024 00:08:30 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: David Gow <davidgow@...gle.com>
Cc: Rae Moar <rmoar@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Miguel Ojeda <ojeda@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, Masahiro Yamada <masahiroy@...nel.org>, 
	Jamie Cunliffe <Jamie.Cunliffe@....com>, Catalin Marinas <catalin.marinas@....com>, 
	Richard Weinberger <richard@....at>, Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
	Johannes Berg <johannes@...solutions.net>, kunit-dev@...glegroups.com, 
	linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org, 
	rust-for-linux@...r.kernel.org, x86@...nel.org, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.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>
Subject: Re: [PATCH] arch: um: rust: Use the generated target.json again

On Wed, May 29, 2024 at 11:33 AM David Gow <davidgow@...gle.com> wrote:
>
> The Rust compiler can take a target config from 'target.json', which is
> generated by scripts/generate_rust_target.rs. It used to be that all
> Linux architectures used this to generate a target.json, but now
> architectures must opt-in to this, or they will default to the Rust
> compiler's built-in target definition.
>
> This is mostly okay for (64-bit) x86 and UML, except that it can
> generate SSE instructions, which we can't use in the kernel. So
> re-instate the custom target.json, which disables SSE (and generally
> enables the 'soft-float' feature). This fixes the following compile
> error:
>
> error: <unknown>:0:0: in function _RNvMNtCs5QSdWC790r4_4core3f32f7next_up float (float): SSE register return with SSE disabled
>
> Fixes: f82811e22b48 ("rust: Refactor the build target to allow the use of builtin targets")
> Signed-off-by: David Gow <davidgow@...gle.com>

I guess this should go through UML, but please let me know otherwise
(I don't see it in next).

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

Should this have a

Cc: stable@...r.kernel.org

too?

Thanks!

Cheers,
Miguel