linux-kernel - Re: [PATCH v4] rust: locks: Add `get

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Message-ID: <CAH5fLggS6H+y6dBUkyecUyKHU5e_ueEmGEXh=DA00doqiVDEvA@mail.gmail.com>
Date: Tue, 27 Feb 2024 15:51:08 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: mathys35.gasnier@...il.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>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Martin Rodriguez Reboredo <yakoyoku@...il.com>
Subject: Re: [PATCH v4] rust: locks: Add `get_mut` method to `Lock`

On Mon, Feb 26, 2024 at 2:55 PM Mathys-Gasnier via B4 Relay
<devnull+mathys35.gasnier.gmail.com@...nel.org> wrote:
>
> From: Mathys-Gasnier <mathys35.gasnier@...il.com>
>
> Having a mutable reference guarantees that no other threads have
> access to the lock, so we can take advantage of that to grant callers
> access to the protected data without the the cost of acquiring and
> releasing the locks. Since the lifetime of the data is tied to the
> mutable reference, the borrow checker guarantees that the usage is safe.
>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
> Signed-off-by: Mathys-Gasnier <mathys35.gasnier@...il.com>

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