linux-kernel - Re: [PATCH RFC 0/6] Rust Abstractions for PWM subsystem with TH1520 PWM driver

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Message-Id: <DA5YY0YF28GO.3DONTQDLY6VBD@kernel.org>
Date: Mon, 26 May 2025 11:01:58 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Michal Wilczynski" <m.wilczynski@...sung.com>, "Drew Fustini"
 <pdp7pdp7@...il.com>
Cc: Uwe Kleine-König <ukleinek@...nel.org>, "Miguel Ojeda"
 <ojeda@...nel.org>, "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@...nel.org>,
 "Alice Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 "Danilo Krummrich" <dakr@...nel.org>, "Drew Fustini" <drew@...7.com>, "Guo
 Ren" <guoren@...nel.org>, "Fu Wei" <wefu@...hat.com>, "Rob Herring"
 <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor
 Dooley" <conor+dt@...nel.org>, "Paul Walmsley" <paul.walmsley@...ive.com>,
 "Palmer Dabbelt" <palmer@...belt.com>, "Albert Ou" <aou@...s.berkeley.edu>,
 "Alexandre Ghiti" <alex@...ti.fr>, "Marek Szyprowski"
 <m.szyprowski@...sung.com>, <linux-kernel@...r.kernel.org>,
 <linux-pwm@...r.kernel.org>, <rust-for-linux@...r.kernel.org>,
 <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC 0/6] Rust Abstractions for PWM subsystem with TH1520
 PWM driver

On Mon May 26, 2025 at 10:22 AM CEST, Michal Wilczynski wrote:
> On 5/25/25 00:21, Drew Fustini wrote:
>> Thanks for the patch series. It will be great to have PWM working
>> upstream.
>> 
>> I've not built Linux with Rust before, so I'm going through the quick
>> start [1]. I've also never built Linux with LLVM before but clang seems
>> like the best compiler to use for Rust. Are you using LLVM?
>
> Hi Drew,
> You're correct, Clang is the way to go for Rust in the kernel. I also
> followed the official quick start guide. To answer your question
> directly: yes, I'm using LLVM.

Just to let you know, there is an effort to get rustc to work with a gcc
backend rustc_gcc_codegen [1]. And there also is the gccrs project [2]
trying to create a gnu Rust compiler.

[1]: https://rust-for-linux.com/rustc_codegen_gcc
[2]: https://rust-for-linux.com/gccrs

They have made a lot of progress over the last year, so we're hopeful
that they become usable in the near future. But for the moment,
Clang/LLVM is the way to go.

Hope this helps!

---
Cheers,
Benno