linux-kernel - Re: [PATCH 01/11] rust: pin-init: internal: remove proc-macro[2] and quote workarounds

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Message-Id: <DFGJ1HIK35BN.3RLLMFT1PLP0C@kernel.org>
Date: Mon, 05 Jan 2026 09:53:23 +0100
From: "Benno Lossin" <lossin@...nel.org>
To: "Tamir Duberstein" <tamird@...il.com>, "Gary Guo" <gary@...yguo.net>
Cc: "Miguel Ojeda" <ojeda@...nel.org>, "Boqun Feng" <boqun.feng@...il.com>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, "Alice Ryhl" <aliceryhl@...gle.com>,
 "Trevor Gross" <tmgross@...ch.edu>, "Danilo Krummrich" <dakr@...nel.org>,
 "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 01/11] rust: pin-init: internal: remove proc-macro[2]
 and quote workarounds

On Sun Jan 4, 2026 at 2:35 PM CET, Tamir Duberstein wrote:
> On Thu, Dec 11, 2025 at 2:28 PM Gary Guo <gary@...nel.org> wrote:
>>
>> From: Benno Lossin <lossin@...nel.org>
>>
>> The kernel only had the `proc-macro` library available, whereas the
>> user-space version also used `proc-macro2` and `quote`. Now both are
>> available to the kernel, making it possible to remove the workarounds.
>>
>> Signed-off-by: Benno Lossin <lossin@...nel.org>
>> Co-developed-by: Gary Guo <gary@...yguo.net>
>> Signed-off-by: Gary Guo <gary@...yguo.net>
>
> This adds a dependency edge from pin-init-internal to syn, but syn is
> not actually used in pin-init or pin-init-internal.
>
> There's a comment in rust/pin-init/src/macros.rs that suggests syn
> might be used in the future, but as of this comment this is a dead
> dependency edge.

I have a patchset prepared in [1] and plan to send that this cycle.

[1]: https://github.com/Rust-for-Linux/pin-init/pull/89

Cheers,
Benno