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

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Message-ID: <CANiq72mvTTgyTjDCWBz_kOdY1f4gopAtWxyC4P4c+Lr0YVkzLA@mail.gmail.com>
Date: Tue, 3 Sep 2024 21:01:23 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Jiaxun Yang <jiaxun.yang@...goat.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

On Tue, Sep 3, 2024 at 8:32 PM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
>
> Ahh thanks for the elaboration.

You're welcome!

> However, kernel supports many ISA variants that are not defined by any rust target
> triple, I'm not really sure if it's appropriate to define them all in upstream.

They need to be in upstream Rust somehow, because upstream Rust does
not want to stabilize `target.json` since it is too tied to LLVM (as
far as we have been told). Whether that is via `-Ctarget-feature`, or a
new `-Cglobal-target-feature`, or specific flags like `-Zfixed-x18`
(originally `-Ctarget-feature=+reserve-x18`), or (many) new target
triples for different combinations, or something else, it depends on
the case and what upstream Rust wants to do.

That is why we should tell them what is needed, ideally in a new issue
in upstream Rust, and link it in
https://github.com/Rust-for-Linux/linux/issues/355 (please see that
list for similar examples).

I hope that explains a bit more the context.

Cheers,
Miguel