linux-kernel - Re: [PATCH v5 01/10] rust: Introduce atomic API helpers

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Message-ID: <aF6j5158xC_mEAHM@Mac.home>
Date: Fri, 27 Jun 2025 07:00:07 -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 01/10] rust: Introduce atomic API helpers

On Thu, Jun 26, 2025 at 10:44:13AM +0200, Andreas Hindborg wrote:
> "Boqun Feng" <boqun.feng@...il.com> writes:
> 
> > In order to support LKMM atomics in Rust, add rust_helper_* for atomic
> > APIs. These helpers ensure the implementation of LKMM atomics in Rust is
> > the same as in C. This could save the maintenance burden of having two
> > similar atomic implementations in asm.
> >
> > Originally-by: Mark Rutland <mark.rutland@....com>
> > Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> > ---
> >  rust/helpers/atomic.c                     | 1038 +++++++++++++++++++++
> >  rust/helpers/helpers.c                    |    1 +
> >  scripts/atomic/gen-atomics.sh             |    1 +
> >  scripts/atomic/gen-rust-atomic-helpers.sh |   65 ++
> >  4 files changed, 1105 insertions(+)
> >  create mode 100644 rust/helpers/atomic.c
> >  create mode 100755 scripts/atomic/gen-rust-atomic-helpers.sh
> >
> > diff --git a/rust/helpers/atomic.c b/rust/helpers/atomic.c
> > new file mode 100644
> > index 000000000000..00bf10887928
> > --- /dev/null
> > +++ b/rust/helpers/atomic.c
> > @@ -0,0 +1,1038 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +// Generated by scripts/atomic/gen-rust-atomic-helpers.sh
> > +// DO NOT MODIFY THIS FILE DIRECTLY
> 
> If this file is generated, why check it in? Can't we run the generator
> at build time?
> 

Greg asked the same question, and it has been answered in v1:

	https://lore.kernel.org/rust-for-linux/ZmrLmnPz_0Q8oXny@J2N7QTR9R3/

I'm simply following what we already do for other version of atomic
APIs.

Regards,
Boqun

> 
> Best regards,
> Andreas Hindborg
> 
>