linux-kernel - Re: [PATCH v3 0/1] RISC-V: enable rust

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Message-ID: <871q7d73of.fsf@all.your.base.are.belong.to.us>
Date: Wed, 10 Apr 2024 15:22:40 +0200
From: Björn Töpel <bjorn@...nel.org>
To: Conor Dooley <conor@...nel.org>, linux-riscv@...ts.infradead.org
Cc: conor@...nel.org, Conor Dooley <conor.dooley@...rochip.com>, 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>, rust-for-linux@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH v3 0/1] RISC-V: enable rust

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

> From: Conor Dooley <conor.dooley@...rochip.com>
>
> I've intentionally not turned on the gcc support, as discussed on
> v1. I've also switched over to using the target, but it is a bit heavier
> than the one arm64 seems to be using. RISC-V has fewer targets available
> and this was the closest. I preserved the redzone disabling, just moved
> into the Makefile. Any comment from Gary or the LLVM lads on the target
> would be great I think:
> https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/targets/riscv64imac_unknown_none_elf.rs
> arm64 is using:
> https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
>
> I was gonna send this yesterday, but found out last minute I had invalid
> code in the target generation script. The kernel test robot had given my
> branch the global all-clear - the rust coverage with all the
> "depends on !FOO" must really limit the build coverage. I built for x86
> with rust enabled locally this time to make sure..
>
> As this as lifted from the state of the Rust-for-Linux tree, the commit
> messages from there cannot be preserved, so these patches have commit
> messages that I wrote.
>
> I've tested this on Icicle, and the modules seem to work as expected.
> Unfortunately there appear to be implicit 32-bit divisions (or similar)
> in core Rust code, so, as in the downstream Rust-for-Linux tree, Rust is
> only enabled for 64-bit.

Nice, works with my simple test on VisionFive 2 as well! Cool to have
Rust support in! Now, BTF just needs to be supported, and I can have
Rust *and* BPF in my kernels! :-P \o/

Tested-by: Björn Töpel <bjorn@...osinc.com>