linux-kernel - Re: [PATCH v5] rust: rbtree: add immutable cursor

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Message-ID: <aO9Uds521WM1n8_X@google.com>
Date: Wed, 15 Oct 2025 07:59:50 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Vitaly Wool <vitaly.wool@...sulko.se>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Danilo Krummrich <dakr@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Bjorn Roy Baron <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	"Onur Özkan" <work@...rozkan.dev>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [PATCH v5] rust: rbtree: add immutable cursor

On Tue, Oct 14, 2025 at 02:33:39PM +0200, Vitaly Wool wrote:
> Sometimes we may need to iterate over, or find an element in a read
> only (or read mostly) red-black tree, and in that case we don't need a
> mutable reference to the tree, which we'll however have to take to be
> able to use the current (mutable) cursor implementation.
> 
> This patch adds a simple immutable cursor implementation to RBTree,
> which enables us to use an immutable tree reference. The existing
> (fully featured) cursor implementation is renamed to CursorMut,
> while retaining its functionality.
> 
> The only existing user of the [mutable] cursor for RBTrees (binder) is
> updated to match the changes.
> 
> Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.se>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>