linux-kernel - Re: [PATCH v8 2/6] rust: rbtree: add red-black tree implementation backed by the C version

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Message-ID: <ZqlhHD_Qvei0zamr@boqun-archlinux>
Date: Tue, 30 Jul 2024 14:54:36 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Matt Gilbride <mattgilbride@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Carlos Llamas <cmllamas@...gle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Christian Brauner <brauner@...nel.org>,
	Rob Landley <rob@...dley.net>, Davidlohr Bueso <dave@...olabs.net>,
	Michel Lespinasse <michel@...pinasse.org>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 2/6] rust: rbtree: add red-black tree implementation
 backed by the C version

On Sat, Jul 27, 2024 at 08:30:47PM +0000, Matt Gilbride wrote:
[...]
> +/// A memory reservation for a red-black tree node.
> +///
> +///
> +/// It contains the memory needed to hold a node that can be inserted into a red-black tree. One
> +/// can be obtained by directly allocating it ([`RBTreeNodeReservation::new`]).
> +pub struct RBTreeNodeReservation<K, V> {
> +    node: Box<MaybeUninit<Node<K, V>>>,
> +}
> +
> +impl<K, V> RBTreeNodeReservation<K, V> {
> +    /// Allocates memory for a node to be eventually initialised and inserted into the tree via a
> +    /// call to [`RBTree::insert`].
> +    pub fn new(flags: Flags) -> Result<RBTreeNodeReservation<K, V>> {
> +        Ok(RBTreeNodeReservation {
> +            node: Box::new_uninit(flags)?,

This will cause a rusttest error, although I'm not sure whether we want
to keep doing <Box<_> as BoxExt<_>>::new_uninit() to shutdown this kind
of errors since we are going to have our own alloc mod.

Regards,
Boqun

> +        })
> +    }
> +}
> +
[...]