linux-kernel - Re: [PATCH v3 2/2] kbuild: rust: provide an option to inline C helpers into Rust

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Message-ID: <CANiq72nc-A2WZn4xgfKyqr3GbgenhXjZztHqnf=12xY16ggHkg@mail.gmail.com>
Date: Wed, 9 Apr 2025 22:41:14 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: 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>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <nick.desaulniers+lkml@...il.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>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Tamir Duberstein <tamird@...il.com>, Christian Brauner <brauner@...nel.org>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Dirk Behme <dirk.behme@...bosch.com>, Daniel Xu <dxu@...uu.xyz>, 
	"Steven Rostedt (Google)" <rostedt@...dmis.org>, FUJITA Tomonori <fujita.tomonori@...il.com>, 
	"Rob Herring (Arm)" <robh@...nel.org>, Matt Gilbride <mattgilbride@...gle.com>, 
	Paul Moore <paul@...l-moore.com>, Kees Cook <kees@...nel.org>, rust-for-linux@...r.kernel.org, 
	llvm@...ts.linux.dev, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] kbuild: rust: provide an option to inline C
 helpers into Rust

On Wed, Apr 9, 2025 at 10:18 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> Is this compatible with DEBUG_INFO_BTF? I'm concerned that we have the
> same issue as in commit 5daa0c35a1f0 ("rust: Disallow BTF generation
> with Rust + LTO").
>
> The commit message should either explain why we don't have the same
> issue, or this patch should prevent configurations from enabling both.

In addition, from what we discussed in the call, it would be nice to
have some performance numbers compared to not enabling it, as well as
compared to cross-language LTO.

It would also help to know which users out there need/want to have this.

Thanks!

Cheers,
Miguel