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

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Message-ID: <aF6uZLX1zr2MP6Ne@Mac.home>
Date: Fri, 27 Jun 2025 07:44:52 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: 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>, Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>, Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.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 Fri, Jun 27, 2025 at 07:34:46AM -0700, Boqun Feng wrote:
> On Thu, Jun 26, 2025 at 02:36:50PM +0200, Andreas Hindborg wrote:
> [...]
> > > +/// The trait bound for annotating operations that should support all orderings.
> > > +pub trait All: internal::OrderingUnit {}
> > 
> > I think I would prefer `Any` rather than `All` here. Because it is "any
> > of", not "all of them at once".
> > 
> 
> Good idea! Changed. Thanks!
> 

And I realized I can unify `Any` with `OrderingUnit`, here is the what I
have now:

mod internal {
    /// Sealed trait, can be only implemented inside atomic mod.
    pub trait Sealed {}

    impl Sealed for super::Relaxed {}
    impl Sealed for super::Acquire {}
    impl Sealed for super::Release {}
    impl Sealed for super::Full {}
}

/// The trait bound for annotating operations that support any ordering.
pub trait Any: internal::Sealed {
    /// Describes the exact memory ordering.
    const TYPE: OrderingType;
}

impl Any for Relaxed {
    const TYPE: OrderingType = OrderingType::Relaxed;
}

impl Any for Acquire {
    const TYPE: OrderingType = OrderingType::Acquire;
}

impl Any for Release {
    const TYPE: OrderingType = OrderingType::Release;
}

impl Any for Full {
    const TYPE: OrderingType = OrderingType::Full;
}

Better than what I had before, thanks!

Regards,
Boqun