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

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Message-ID: <aEXBH5r05FkTxpV+@x1>
Date: Sun, 8 Jun 2025 09:58:07 -0700
From: Drew Fustini <drew@...7.com>
To: Benno Lossin <lossin@...nel.org>,
	Michal Wilczynski <m.wilczynski@...sung.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>, 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 11:01:58AM +0200, Benno Lossin wrote:
> 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

Thanks for letting me know about gccrs.

I was able to build linux okay with clang:

make LLVM=1 ARCH=riscv -j16

It booted okay on the lpi4a:

Linux version 6.15.0-next-20250606 (pdp7@...lio) (Ubuntu clang version 18.1.3 (1ubuntu1), Ubuntu LLD 18.1.3) 

I installed rust with:

 rustup default beta
 rustup component add rust-src

 $ make LLVM=1 rustavailable
 ***
 *** Rust bindings generator 'bindgen' versions 0.66.0 and 0.66.1 may not
 *** work due to a bug (https://github.com/rust-lang/rust-bindgen/pull/2567),
 *** unless patched (like Debian's).
 ***   Your version:     0.66.1
 ***
 ***
 *** Please see Documentation/rust/quick-start.rst for details
 *** on how to set up the Rust support.
 ***
 Rust is available!

I'm not sure if that bindgen warning matters?

Thanks,
Drew