linux-kernel - Re: [PATCH] rust: pin-init: add references to previously initialized fields

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Message-ID: <aL46nRkYj2SlOhl8@tardis-2.local>
Date: Sun, 7 Sep 2025 19:08:29 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Benno Lossin <lossin@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...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>, Alban Kurti <kurti@...icto.ai>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczy´nski <kwilczynski@...nel.org>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rust: pin-init: add references to previously initialized
 fields

On Mon, Sep 08, 2025 at 01:33:26AM +0200, Danilo Krummrich wrote:
> On Mon Sep 8, 2025 at 12:51 AM CEST, Benno Lossin wrote:
> > I actually came up with a third option that looks best IMO:
> >
> >     init!(MyStruct {
> >         x: 42,
> >         #[with_binding]
> >         y: 24,
> >         z: *y,
> >     })
> >
> > The `#[with_binding]` attribute makes the macro generate a variable `y`.
> > `x` & `z` don't give access to their value. (we of course should come up
> > with a better name).
> >
> > Any thoughts?
> 
> It may be a bit verbose is some cases, but it makes things pretty obvious, so
> LGTM.
> 
> How about just #[bind] or #[access]?

#[shadow] or #[maybe_rebind] ? Or #[pin_ref], the last one is clear
about the purpose.

Regards,
Boqun