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References: <20240226-rust-locks-get-mut-v4-1-24abf57707a8@gmail.com>
In-Reply-To: <20240226-rust-locks-get-mut-v4-1-24abf57707a8@gmail.com>
From: Alice Ryhl <aliceryhl@google.com>
Date: Tue, 27 Feb 2024 15:51:08 +0100
Message-ID: <CAH5fLggS6H+y6dBUkyecUyKHU5e_ueEmGEXh=DA00doqiVDEvA@mail.gmail.com>
Subject: Re: [PATCH v4] rust: locks: Add `get_mut` method to `Lock`
To: mathys35.gasnier@gmail.com
Cc: Miguel Ojeda <ojeda@kernel.org>, Alex Gaynor <alex.gaynor@gmail.com>, 
	Wedson Almeida Filho <wedsonaf@gmail.com>, Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>, 
	=?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, 
	Benno Lossin <benno.lossin@proton.me>, Andreas Hindborg <a.hindborg@samsung.com>, 
	rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, 
	Martin Rodriguez Reboredo <yakoyoku@gmail.com>
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On Mon, Feb 26, 2024 at 2:55=E2=80=AFPM Mathys-Gasnier via B4 Relay
<devnull+mathys35.gasnier.gmail.com@kernel.org> wrote:
>
> From: Mathys-Gasnier <mathys35.gasnier@gmail.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@gmail.com>
> Signed-off-by: Mathys-Gasnier <mathys35.gasnier@gmail.com>

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