linux-kernel - Re: [PATCH 0/3] Remove the usage of Rust native atomics in debugfs

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Message-ID: <aPjZ-yA4ihZqlNwb@tardis-2.local>
Date: Wed, 22 Oct 2025 09:19:55 -0400
From: Boqun Feng <boqun.feng@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Matthew Maurer <mmaurer@...gle.com>
Subject: Re: [PATCH 0/3] Remove the usage of Rust native atomics in debugfs

On Wed, Oct 22, 2025 at 10:07:17AM +0200, Peter Zijlstra wrote:
> On Tue, Oct 21, 2025 at 11:53:21PM -0400, Boqun Feng wrote:
> > Rust native atomics are not supposed to be used in kernel due to the
> > mismatch of memory model, since we now have the LKMM atomics in Rust,
> > remove the usage of Rust native atomics in debugfs.
> 
> Doesn't rust have a language feature that allows you to blacklist them;
> ensuring they are not used?
> 

Although I don't know whether it's available today, but I believe that
can be done (in the future probably?).

However, this patchset is about cleaning up the existing usage, which
was introduced before we have LKMM atomics on the Rust side.

Regards,
Boqun

>