linux-kernel - Re: [PATCH v2 2/3] kbuild: rust: provide an option to inline C helpers into Rust

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Message-ID: <aacd5e49-2539-4cf5-a3d2-76583e04e08f@infradead.org>
Date: Sun, 5 Jan 2025 22:08:14 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Gary Guo <gary@...yguo.net>, Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>,
 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>, Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Masahiro Yamada <masahiroy@...nel.org>, Nicolas Schier <nicolas@...sle.eu>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Dirk Behme <dirk.behme@...bosch.com>, Tamir Duberstein <tamird@...il.com>,
 Christian Brauner <brauner@...nel.org>,
 Martin Rodriguez Reboredo <yakoyoku@...il.com>,
 Paul Moore <paul@...l-moore.com>, Wedson Almeida Filho <wedsonaf@...il.com>,
 "Steven Rostedt (Google)" <rostedt@...dmis.org>,
 Matt Gilbride <mattgilbride@...gle.com>, Danilo Krummrich <dakr@...nel.org>,
 Eder Zulian <ezulian@...hat.com>, Filipe Xavier <felipe_life@...e.com>
Cc: rust-for-linux@...r.kernel.org, llvm@...ts.linux.dev,
 Kees Cook <kees@...nel.org>, Daniel Xu <dxu@...uu.xyz>,
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] kbuild: rust: provide an option to inline C
 helpers into Rust



On 1/5/25 11:40 AM, Gary Guo wrote:
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index f3d723705879..8a8834128f13 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -3253,6 +3253,20 @@ config RUST_KERNEL_DOCTESTS
>  
>  	  If unsure, say N.
>  
> +config RUST_INLINE_HELPERS
> +    bool "Inline C helpers into Rust crates"
> +    depends on RUST && RUSTC_CLANG_LLVM_COMPATIBLE
> +    help
> +        Links C helpers into with Rust crates through LLVM IR.

cannot parse "into with".

> +
> +        If this option is enabled, instead of generating object files directly,
> +        rustc is asked to produce LLVM IR, which is then linked together with
> +        the LLVM IR of C helpers, before object file is generated.
> +
> +        This requires a matching LLVM version for Clang and rustc.
> +
> +        If unsure, say N.
> +
>  endmenu # "Rust"

-- 
~Randy