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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: Alice Ryhl <aliceryhl@google.com>
Date: Mon, 12 Feb 2024 15:22:14 +0100
Message-ID: <CAH5fLghTKpLs=Wb03cjx0LRQbZgmXRoMNy1cyheb7cQRL0mjsw@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>, 
	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 12, 2024 at 3:13=E2=80=AFPM Mathys-Gasnier via B4 Relay
<devnull+mathys35.gasnier.gmail.com@kernel.org> wrote:
> +    /// Gets the data contained in the lock
> +    /// Having a mutable reference to the lock guarantees that no other =
threads have access to the lock.
> +    /// Making it safe to get a mutable reference to the lock content.
> +    pub fn get_mut(&mut self) -> &mut T {
> +        self.data.get_mut()
> +    }

It's impossible to call this method. You can never have a mutable
reference to a Linux mutex because we pin our locks. At most, you can
have a Pin<&mut Self>.

Alice