linux-kernel - Re: [PATCH v2 3/3] rust: Enable for MIPS

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Message-ID: <alpine.DEB.2.21.2409082138160.60835@angie.orcam.me.uk>
Date: Sun, 8 Sep 2024 21:43:02 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
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>, 
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    Alice Ryhl <aliceryhl@...gle.com>, 
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    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-trace-kernel@...r.kernel.org, 
    linux-doc@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 3/3] rust: Enable for MIPS

On Thu, 5 Sep 2024, Jiaxun Yang wrote:

> diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs
> index 863720777313..bbdf8a4dd169 100644
> --- a/scripts/generate_rust_target.rs
> +++ b/scripts/generate_rust_target.rs
[...]
> +        } else {
> +            ts.push("arch", "mips");
> +            cfg.get("TARGET_ISA_REV").map(|isa_rev| {
> +                let feature = match isa_rev.as_str() {
> +                    "1" => ",+mips32",
> +                    "2" => ",+mips32r2",
> +                    "5" => ",+mips32r5",
> +                    "6" => ",+mips32r6",
> +                    _ => ",+mips2",

 What's the consequence of using `mips2' rather than `mips1' here?  How 
about other ISA revisions, e.g. `mips4' (that also applies to the 64BIT 
leg)?

  Maciej