linux-kernel - Re: [PATCH 3/3] rust: Enable for MIPS

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Message-Id: <d9591a84-9a0f-4046-9b2a-437061f6882b@app.fastmail.com>
Date: Tue, 03 Sep 2024 18:53:25 +0100
From: "Jiaxun Yang" <jiaxun.yang@...goat.com>
To: "Miguel Ojeda" <miguel.ojeda.sandonis@...il.com>
Cc: "Masahiro Yamada" <masahiroy@...nel.org>,
 "Nathan Chancellor" <nathan@...nel.org>,
 "Nicolas Schier" <nicolas@...sle.eu>,
 "Richard Weinberger" <richard@....at>,
 "Anton Ivanov" <anton.ivanov@...bridgegreys.com>,
 "Johannes Berg" <johannes@...solutions.net>,
 "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>,
 "Borislav Petkov" <bp@...en8.de>,
 "Dave Hansen" <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.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>,
 "Benno Lossin" <benno.lossin@...ton.me>,
 "Andreas Hindborg" <a.hindborg@...sung.com>,
 "Alice Ryhl" <aliceryhl@...gle.com>,
 "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
 "Steven Rostedt" <rostedt@...dmis.org>,
 "Masami Hiramatsu" <mhiramat@...nel.org>,
 "Mark Rutland" <mark.rutland@....com>,
 "Jonathan Corbet" <corbet@....net>, "Alex Shi" <alexs@...nel.org>,
 "Yanteng Si" <siyanteng@...ngson.cn>,
 "Nick Desaulniers" <ndesaulniers@...gle.com>,
 "Bill Wendling" <morbo@...gle.com>,
 "Justin Stitt" <justinstitt@...gle.com>, linux-kbuild@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org,
 rust-for-linux@...r.kernel.org,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
 linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH 3/3] rust: Enable for MIPS

在2024年9月3日九月 下午6:44，Miguel Ojeda写道：
> On Tue, Sep 3, 2024 at 7:15 PM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
>>
>> We don't use builtin target as there is no sutiable baremetal
>> target for us that can cover all ISA variants supported by kernel.
>
> Since we should try to go away from using `target.json`: what was not
> possible to enable via e.g. `-Ctarget-features` or other flags? i.e. I
> see the `+mips*` features there in the supported list, and from a
> quick test the data layout also seems to match, but I assume I missed
> something.
>
> If it is not possible, then we should definitely ping upstream Rust about it. :)
Hi Miguel,

Thanks for your review!

Triples defined for MIPS bare-metal target is surprisingly lacking, we do have
little-endian 32-bit bare-metal target mipsel-unknown-none but big-endian and
64 bit variants are missing.

Also, those triples all assumed +mips32r2 as baseline ISA, but kernel actually needs
some other ISA variant features.

Thanks
>
> Cheers,
> Miguel

-- 
- Jiaxun