linux-kernel - Re: [PATCH] rust: avoid `box_uninit

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Message-ID: <CANiq72k3Fs6Cj7mnhQaNdS4bAWjsvg_=0+EcH_hUhX97BMwUjw@mail.gmail.com>
Date: Wed, 4 Sep 2024 23:16:24 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Matt Gilbride <mattgilbride@...gle.com>, Danilo Krummrich <dakr@...nel.org>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	patches@...ts.linux.dev
Subject: Re: [PATCH] rust: avoid `box_uninit_write` feature

On Wed, Sep 4, 2024 at 4:43 PM Miguel Ojeda <ojeda@...nel.org> wrote:
>
> Like commit 0903b9e2a46c ("rust: alloc: eschew
> `Box<MaybeUninit<T>>::write`"), but for the new `rbtree` and `alloc` code.
>
> That is, `feature(new_uninit)` [1] got partially stabilized [2]
> for Rust 1.82.0 (expected to be released on 2024-10-17), but it
> did not include `Box<MaybeUninit<T>>::write`, which got split into
> `feature(box_uninit_write)` [3].
>
> To avoid relying on a new unstable feature, rewrite the `write` +
> `assume_init` pair manually.
>
> Link: https://github.com/rust-lang/rust/issues/63291 [1]
> Link: https://github.com/rust-lang/rust/pull/129401 [2]
> Link: https://github.com/rust-lang/rust/issues/129397 [3]
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>

Applied to `rust-next` -- thanks Alice and Matt for the quick reviews!

Cheers,
Miguel