linux-kernel - Re: [PATCH v2] rust: locks: Add `get

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Message-ID: <CAH5fLghTKpLs=Wb03cjx0LRQbZgmXRoMNy1cyheb7cQRL0mjsw@mail.gmail.com>
Date: Mon, 12 Feb 2024 15:22:14 +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 v2] rust: locks: Add `get_mut` method to `Lock`

On Mon, Feb 12, 2024 at 3:13 PM Mathys-Gasnier via B4 Relay
<devnull+mathys35.gasnier.gmail.com@...nel.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