linux-kernel - [PATCH v6 0/9] LKMM generic atomics in Rust

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Message-Id: <20250710060052.11955-1-boqun.feng@gmail.com>
Date: Wed,  9 Jul 2025 23:00:43 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	lkmm@...ts.linux.dev,
	linux-arch@...r.kernel.org
Cc: "Miguel Ojeda" <ojeda@...nel.org>,
	"Alex Gaynor" <alex.gaynor@...il.com>,
	"Boqun Feng" <boqun.feng@...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>,
	"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>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH v6 0/9] LKMM generic atomics in Rust

Hi all,

This is the v6 of LKMM atomics in Rust, you can find the previous
versions at:

v5: https://lore.kernel.org/rust-for-linux/20250618164934.19817-1-boqun.feng@gmail.com/
v4: https://lore.kernel.org/rust-for-linux/20250609224615.27061-1-boqun.feng@gmail.com/
v3: https://lore.kernel.org/rust-for-linux/20250421164221.1121805-1-boqun.feng@gmail.com/
v2: https://lore.kernel.org/rust-for-linux/20241101060237.1185533-1-boqun.feng@gmail.com/
v1: https://lore.kernel.org/rust-for-linux/20240612223025.1158537-1-boqun.feng@gmail.com/
wip: https://lore.kernel.org/rust-for-linux/20240322233838.868874-1-boqun.feng@gmail.com/

I dropped the support for atomic pointers for now
(Atomic<{isize,usize}> still exists), because further more work is
needed to ensure the implementation could preserve provenance [1]. And
we already other series depending on atomics [2], so it makes sense to
get some basic support in-tree.

Peter & Ingo, I take it that it's OK for me to send a PR to tip later
this week or early next week if things went well? Of course, any
feedback is welcome!

Changes since v5:

* Replace `as` cast with `ptr.cast()` in atomic/ops.rs per the
  suggestion of Andreas.
* Explicitly document `Acquire` and `Release` ordering definition per
  the suggestion of Peter.
* Rename `All` to `Any` for ordering accept traits per the suggestion of
  Andreas.
* Remove unnecessary fields in `AcquireOrRelaxed` and `ReleaseOrRelaxed`
  per the suggestion of Gary.
* Add round-trip transmutability (thanks Benno) as the safety
  requirement of `AllowAtomic` per discussion with Gary and Benno.
* Add doc alias for xchg() and cmpxchg() per the suggestion of Benno.
* Examples and documentation improvement.
* Applied Reviewed-by tags from Alice and Andreas.

[1]: https://lore.kernel.org/rust-for-linux/aGg4sIORQiG02IoD@Mac.home/
[2]: https://lore.kernel.org/rust-for-linux/20250709-module-params-v3-v16-1-4f926bcccb50@kernel.org/

Regards,
Boqun

Boqun Feng (9):
  rust: Introduce atomic API helpers
  rust: sync: Add basic atomic operation mapping framework
  rust: sync: atomic: Add ordering annotation types
  rust: sync: atomic: Add generic atomics
  rust: sync: atomic: Add atomic {cmp,}xchg operations
  rust: sync: atomic: Add the framework of arithmetic operations
  rust: sync: atomic: Add Atomic<u{32,64}>
  rust: sync: Add memory barriers
  rust: sync: atomic: Add Atomic<{usize,isize}>

 MAINTAINERS                               |    4 +-
 rust/helpers/atomic.c                     | 1040 +++++++++++++++++++++
 rust/helpers/barrier.c                    |   18 +
 rust/helpers/helpers.c                    |    2 +
 rust/kernel/sync.rs                       |    2 +
 rust/kernel/sync/atomic.rs                |  193 ++++
 rust/kernel/sync/atomic/generic.rs        |  567 +++++++++++
 rust/kernel/sync/atomic/ops.rs            |  195 ++++
 rust/kernel/sync/atomic/ordering.rs       |   97 ++
 rust/kernel/sync/barrier.rs               |   65 ++
 scripts/atomic/gen-atomics.sh             |    1 +
 scripts/atomic/gen-rust-atomic-helpers.sh |   67 ++
 12 files changed, 2250 insertions(+), 1 deletion(-)
 create mode 100644 rust/helpers/atomic.c
 create mode 100644 rust/helpers/barrier.c
 create mode 100644 rust/kernel/sync/atomic.rs
 create mode 100644 rust/kernel/sync/atomic/generic.rs
 create mode 100644 rust/kernel/sync/atomic/ops.rs
 create mode 100644 rust/kernel/sync/atomic/ordering.rs
 create mode 100644 rust/kernel/sync/barrier.rs
 create mode 100755 scripts/atomic/gen-rust-atomic-helpers.sh

-- 
2.39.5 (Apple Git-154)