linux-kernel - Re: [RFC PATCH 2/2] kbuild: rust: use klint to provide CONFIG_FRAME

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Message-ID: <CANiq72nK2K4mZNnpJSWP+Z1h3hkwSLtN+FOWKzUYdEJD92sU7A@mail.gmail.com>
Date: Wed, 28 Jan 2026 00:12:41 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Gary Guo <gary@...yguo.net>
Cc: Nathan Chancellor <nathan@...nel.org>, Gary Guo <gary@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, Nicolas Schier <nsc@...nel.org>, 
	Thomas Weißschuh <linux@...ssschuh.net>, 
	Masahiro Yamada <masahiroy@...nel.org>, Kees Cook <kees@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] kbuild: rust: use klint to provide CONFIG_FRAME_WARN

On Tue, Jan 27, 2026 at 11:51 PM Gary Guo <gary@...yguo.net> wrote:
>
> Lints in Rust do not take arguments, so there's no way to represent something
> similar to `-Wframe-larger-than=foo`. However, I've made klint search [1] for
> `CONFIG_FRAME_WARN` and use whatever value is there.
>
> Link: https://github.com/Rust-for-Linux/klint/blob/168031d93c3aa538c8ef71d1e448ae77c2cef7a7/src/binary_analysis/stack_size.rs#L70-L82 [1]

I would have suggested a `.klint.toml` like Clippy, but with Clippy we
also want to eventually have a flag-based configuration instead of a
static file (or attributes in the source code which means probably
using conditional compilation in some cases).

So, even if the lint is toggled with `-[AWDF]` style flags, could the
limit be configured in a separate non-`-W` Klint-only flag? Or doesn't
`register_tool` allow for that?

Thanks!

Cheers,
Miguel