linux-kernel - Re: [PATCH v3 09/15] rust: pin-init: rewrite the initializer macros using `syn`

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Message-Id: <DFPIYDMDHC6V.3CT62XJBRQJOD@kernel.org>
Date: Thu, 15 Jan 2026 23:43:19 +0100
From: "Benno Lossin" <lossin@...nel.org>
To: "Tamir Duberstein" <tamird@...il.com>
Cc: "Gary Guo" <gary@...yguo.net>, "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>, "Alban Kurti"
 <kurti@...icto.ai>, <linux-kernel@...r.kernel.org>,
 <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH v3 09/15] rust: pin-init: rewrite the initializer macros
 using `syn`

On Thu Jan 15, 2026 at 10:45 PM CET, Tamir Duberstein wrote:
> On Wed, Jan 14, 2026 at 1:20 PM Benno Lossin <lossin@...nel.org> wrote:
>>
>> Rewrite the initializer macros `[pin_]init!` using `syn`. No functional
>> changes intended aside from improved error messages on syntactic and
>> semantical errors. For example if one forgets to use `<-` with an
>> initializer (and instead uses `:`):
>>
>> <snip>
>>
>> Tested-by: Andreas Hindborg <a.hindborg@...nel.org>
>> Signed-off-by: Benno Lossin <lossin@...nel.org>
>> ---
>>
>> <snip>
>>
>> -#[cfg(kernel)]
>> -pub use ::macros::paste;
>> -#[cfg(not(kernel))]
>> -pub use ::paste::paste;
>
> Now that `cfg(kernel)` is gone, can we also remove it from `rust/Makefile`
> and `scripts/generate_rust_analyzer.py`? That is already done for
> pin-init in patch 3 of this series:
> https://lore.kernel.org/all/20260114181934.1782470-4-lossin@kernel.org/.

I'm still using `cfg(kernel)` in `src/lib.rs` for linking to the std
Box and Arc types.

Also I don't want to have to reintroduce all that infrastructure when I
inevitably have to add new kernel workarounds.

Cheers,
Benno