linux-kernel - Re: [PATCH v3] rust: locks: Add `get

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Message-ID: <42d7d12b-bf5c-4bae-a48f-fa44acfa790e@gmail.com>
Date: Thu, 22 Feb 2024 15:04:36 -0300
From: Martin Rodriguez Reboredo <yakoyoku@...il.com>
To: Mathys Gasnier <mathys35.gasnier@...il.com>,
 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>, Alice Ryhl <aliceryhl@...gle.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] rust: locks: Add `get_mut` method to `Lock`

On 2/22/24 13:26, Mathys-Gasnier via B4 Relay 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.
> 
> Signed-off-by: Mathys-Gasnier <mathys35.gasnier@...il.com>
> ---
> [...]

This looks magnificent as is.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>