linux-kernel - Re: [PATCH v2 2/3] scripts: generate_rust

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Message-ID: <20240227-resolved-deceit-4a59a6af5b71@wendy>
Date: Tue, 27 Feb 2024 10:16:26 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
CC: Conor Dooley <conor@...nel.org>, <linux-riscv@...ts.infradead.org>, Miguel
 Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida
 Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo
	<gary@...yguo.net>, Björn Roy Baron
	<bjorn3_gh@...tonmail.com>, Jonathan Corbet <corbet@....net>, Paul Walmsley
	<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Nathan
 Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>, <rust-for-linux@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<llvm@...ts.linux.dev>
Subject: Re: [PATCH v2 2/3] scripts: generate_rust_target: enable building on
 RISC-V

On Fri, Feb 23, 2024 at 03:39:47PM +0100, Miguel Ojeda wrote:

> Conor Dooley <conor@...nel.org> wrote:

> Thanks for this Connor!




> arm64 is sending these for 6.9:
> 
>     https://git.kernel.org/arm64/c/f82811e22b48
>     https://git.kernel.org/arm64/c/724a75ac9542
> 
> So it would be nice to see if it may be already possible to enable it
> via a builtin target + flags instead of the custom target, e.g. arm64
> does:
> 
>     KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
> 
> and so on.
> 
> If it does not work, it would be good to know what would be needed for
> RISC-V and put it into the unstable features / wanted features list
> for Rust.

Sure, I'll take a look.

> Either way, it is not a blocker (although you will need a rebase after
> arm64 lands to use the `target.json` in the right places).

Nah, I think that is silly. Either this goes in as-is, and there's
fixup done by Linus, or the thing should be converted to match arm64,
assuming that that is possible.

Cheers,
Conor.

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