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

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Message-Id: <DCNALVTE4DIN.1K0U4BGN35CHI@kernel.org>
Date: Mon, 08 Sep 2025 10:57:36 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Benno Lossin" <lossin@...nel.org>
Cc: "Boqun Feng" <boqun.feng@...il.com>, "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 8, 2025 at 10:27 AM CEST, Benno Lossin wrote:
> On Mon Sep 8, 2025 at 4:08 AM CEST, Boqun Feng wrote:
>> 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]?
>
> I like `#[bind]`.
>
>> #[shadow] or #[maybe_rebind] ? Or #[pin_ref], the last one is clear
>> about the purpose.
>
> Hmm in `init!` it's never pinned.

I thought about #[shadow] as well, but it is not really accurate I think, as we
might not shadow anything. #[maybe_rebind] sounds a bit like it conditionally
rebinds, as in "it may not do anything", but it always binds.

So, I think it should one clear instruction, i.e. #[bind], #[access], #[ref],
#[use], #[let], etc.