linux-kernel - Re: [PATCH v3 1/2] rust: kernel: add `drop

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Message-ID: <CAH5fLgj2urZ6OD2ki6E=6EuPqW3Z8BGg8jd6Bgo4OOrNiptnDw@mail.gmail.com>
Date: Mon, 5 Aug 2024 10:43:57 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Benno Lossin <benno.lossin@...ton.me>, Miguel Ojeda <ojeda@...nel.org>, 
	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>, 
	Andreas Hindborg <a.hindborg@...sung.com>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] rust: kernel: add `drop_contents` to `BoxExt`

On Sun, Aug 4, 2024 at 1:22 AM Danilo Krummrich <dakr@...nel.org> wrote:
>
> On 8/3/24 4:16 PM, Benno Lossin wrote:
> > Sometimes (see [1]) it is necessary to drop the value inside of a
> > `Box<T>`, but retain the allocation. For example to reuse the allocation
> > in the future.
> > Introduce a new function `drop_contents` that turns a `Box<T>` into
> > `Box<MaybeUninit<T>>` by dropping the value.
>
> Is this (and the stuff in patch 2) used somewhere? Otherwise, I think it
> would probably make sense to base this work on top of my allocator work.

Yes, please see the red/black tree.
https://lore.kernel.org/rust-for-linux/20240727-b4-rbtree-v8-0-951600ada434@google.com/

Alice