linux-kernel - Re: [PATCH] rust: debugfs: Implement Reader for Mutex<T> only when T is Unpin

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Message-ID: <4b556c24-cd4c-4c1a-a757-5df3a6782e11@kernel.org>
Date: Wed, 22 Oct 2025 11:07:53 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
 Daniel Almeida <daniel.almeida@...labora.com>,
 Matthew Maurer <mmaurer@...gle.com>, Stephen Rothwell
 <sfr@...b.auug.org.au>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
 linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Gary Guo <gary@...yguo.net>, lossin@...nel.org,
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] rust: debugfs: Implement Reader for Mutex<T> only when T
 is Unpin

On 10/22/25 5:42 AM, Boqun Feng wrote:
> Since we are going to make `Mutex<T>` structurally pin the data (i.e.
> `T`), therefore `.lock()` function only returns a `Guard` that can
> dereference a mutable reference to `T` if only `T` is `Unpin`, therefore
> restrict the impl `Reader` block of `Mutex<T>` to that.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>

I assume this can go through the driver-core tree, since it's only about a
conflict in linux-next?