linux-kernel - Re: [PATCH] add `[pin_]init_scope` to execute code before creating an initializer

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Message-Id: <DDO6PXJKZGOU.9AWQMAML1K7J@kernel.org>
Date: Tue, 21 Oct 2025 19:43:27 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Benno Lossin" <lossin@...nel.org>
Cc: "Miguel Ojeda" <ojeda@...nel.org>, "Alex Gaynor"
 <alex.gaynor@...il.com>, "Boqun Feng" <boqun.feng@...il.com>, "Gary Guo"
 <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, "Andreas Hindborg" <a.hindborg@...nel.org>,
 "Alice Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 "Fiona Behrens" <me@...enk.dev>, "Christian Schrefl"
 <chrisi.schrefl@...il.com>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] add `[pin_]init_scope` to execute code before creating
 an initializer

On Thu Oct 16, 2025 at 11:05 PM CEST, Benno Lossin wrote:
> In more complex cases, initializers need to run arbitrary code before
> assigning initializers to fields. While this is possible using the
> underscore codeblock feature (`_: {}`), values returned by such
> functions cannot be used from later field initializers.
>
> The two new functinos `[pin_]init_scope` allow users to first run some
> fallible code and then return an initializer which the function turns
> into a single initializer. This permits using the same value multiple
> times by different fields.
>
> Reviewed-by: Gary Guo <gary@...yguo.net>
> Reviewed-by: Danilo Krummrich <dakr@...nel.org>
> Signed-off-by: Benno Lossin <lossin@...nel.org>

Applied to driver-core-testing, thanks!

    [ Fix typo in commit message: s/functinos/functions/. - Danilo ]

Benno, thanks a lot for providing this patch as prerequisite for [1]; your quick
support with pin-init whenever something comes up is much appreciated!

[1] https://lore.kernel.org/all/20251016125544.15559-1-dakr@kernel.org/