linux-kernel - Re: [PATCH 08/12] rust: pin-init: rewrite the initializer macros using `syn`

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Message-Id: <DFLAKHLT86N8.11AVQHO5M8UC2@kernel.org>
Date: Sun, 11 Jan 2026 00:18:22 +0100
From: "Benno Lossin" <lossin@...nel.org>
To: "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>
Cc: <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH 08/12] rust: pin-init: rewrite the initializer macros
 using `syn`

On Sat Jan 10, 2026 at 8:20 PM CET, Gary Guo wrote:
> On Sat Jan 10, 2026 at 6:14 PM GMT, Benno Lossin wrote:
>> On Fri Jan 9, 2026 at 2:45 PM CET, Gary Guo wrote:
>>> On Thu Jan 8, 2026 at 1:50 PM GMT, Benno Lossin wrote:
>>>> +                quote! {
>>>> +                    {
>>>> +                        #value_prep
>>>> +                        // SAFETY: TODO
>>>> +                        unsafe { #write(::core::ptr::addr_of_mut!((*#slot).#ident), #value_ident) };
>>>
>>> This should be `&raw mut` now?
>>
>> Yes, but that involves adding workarounds for 1.81 and earlier. I'll
>> leave it for a future series.
>
> You can just enable `raw_ref_op` feature globally. We've already enabled it for
> the kernel crate.

It must be possible to compile the pin-init crate using a stable
compiler. Enabling an already stable feature still causes a compiler
error (last time I checked). So we unfortunately can't enable it without
workarounds.

Cheers,
Benno