linux-kernel - Re: [PATCH 6/6] rust: rbtree: add `RBTree::entry`

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Date: Fri, 9 Feb 2024 14:07:31 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: mattgilbride@...gle.com
Cc: 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>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.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 6/6] rust: rbtree: add `RBTree::entry`

On Mon, Feb 5, 2024 at 4:50 PM <mattgilbride@...gle.com> wrote:
>
> From: Alice Ryhl <aliceryhl@...gle.com>
>
> This mirrors the entry API [1] from the Rust standard library on
> `RBTree`. This API can be used to access the entry at a specific key and
> make modifications depending on whether the key is vacant or occupied.
> This API is useful because it can often be used to avoid traversing the
> tree multiple times.
>
> This is used by binder to look up and conditionally access or insert a
> value, depending on whether it is there or not [2].
>
> Link: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html [1]
> Link: https://android-review.googlesource.com/c/kernel/common/+/2849906 [2]
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Matt Gilbride <mattgilbride@...gle.com>

I wrote this patch, so I will not review it, but I have used it in
Rust Binder, so:

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