linux-kernel - Re: [PATCH v5 03/10] rust: sync: atomic: Add ordering annotation types

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Message-ID: <CAH5fLgjhdxdFztu_pXLjngu4cD7g7jw16bcQYz=XNmGxKfThsA@mail.gmail.com>
Date: Thu, 19 Jun 2025 14:19:23 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, lkmm@...ts.linux.dev, 
	linux-arch@...r.kernel.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>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, Will Deacon <will@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Viresh Kumar <viresh.kumar@...aro.org>, Lyude Paul <lyude@...hat.com>, 
	Ingo Molnar <mingo@...nel.org>, Mitchell Levy <levymitchell0@...il.com>, 
	"Paul E. McKenney" <paulmck@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v5 03/10] rust: sync: atomic: Add ordering annotation types

On Thu, Jun 19, 2025 at 12:31 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Wed, Jun 18, 2025 at 09:49:27AM -0700, Boqun Feng wrote:
>
> > +//! Memory orderings.
> > +//!
> > +//! The semantics of these orderings follows the [`LKMM`] definitions and rules.
> > +//!
> > +//! - [`Acquire`] and [`Release`] are similar to their counterpart in Rust memory model.
>
> So I've no clue what the Rust memory model states, and I'm assuming
> it is very similar to the C11 model. I have also forgotten what LKMM
> states :/
>
> Do they all agree on what RELEASE+ACQUIRE makes?

Rust just uses the C11 model outright, so yes it's the same. There's
no separate Rust memory model as far as atomics are concerned.

Alice