Received-SPF: pass (google.com: domain of linux-kernel+bounces-67347-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Precedence: bulk
MIME-Version: 1.0
References: <20240212-rust-locks-get-mut-v2-1-5ccd34c2b70b@gmail.com>
In-Reply-To: <20240212-rust-locks-get-mut-v2-1-5ccd34c2b70b@gmail.com>
From: Wedson Almeida Filho <wedsonaf@gmail.com>
Date: Thu, 15 Feb 2024 13:52:53 -0300
Message-ID: <CANeycqpk14SVAH4=wU-sbDsEu1BQ7pbBtrt1pCuxm3yKdiwcmw@mail.gmail.com>
Subject: Re: [PATCH v2] 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>, 
	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>, 
	Alice Ryhl <aliceryhl@google.com>, rust-for-linux@vger.kernel.org, 
	linux-kernel@vger.kernel.org, Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Content-Type: text/plain; charset="UTF-8"

On Mon, 12 Feb 2024 at 11:13, 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: Wedson Almeida Filho <walmeida@microsoft.com>