linux-kernel - Re: [PATCH 2/2] rust: sync: atomic: Add atomic operation helpers over raw pointers

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Message-ID: <aW932LmY0IBwrIt7@google.com>
Date: Tue, 20 Jan 2026 12:40:56 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Boqun Feng <boqun.feng@...il.com>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, kasan-dev@...glegroups.com, 
	Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Mark Rutland <mark.rutland@....com>, Gary Guo <gary@...yguo.net>, Miguel Ojeda <ojeda@...nel.org>, 
	"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>, Elle Rhumsaa <elle@...thered-steel.dev>, 
	"Paul E. McKenney" <paulmck@...nel.org>, Marco Elver <elver@...gle.com>, 
	FUJITA Tomonori <fujita.tomonori@...il.com>
Subject: Re: [PATCH 2/2] rust: sync: atomic: Add atomic operation helpers over
 raw pointers

On Tue, Jan 20, 2026 at 07:52:07PM +0800, Boqun Feng wrote:
> In order to synchronize with C or external, atomic operations over raw
> pointers, althought previously there is always an `Atomic::from_ptr()`
> to provide a `&Atomic<T>`. However it's more convenient to have helpers
> that directly perform atomic operations on raw pointers. Hence a few are
> added, which are basically a `Atomic::from_ptr().op()` wrapper.
> 
> Note: for naming, since `atomic_xchg()` and `atomic_cmpxchg()` has a
> conflict naming to 32bit C atomic xchg/cmpxchg, hence they are just
> named as `xchg()` and `cmpxchg()`. For `atomic_load()` and
> `atomic_store()`, their 32bit C counterparts are `atomic_read()` and
> `atomic_set()`, so keep the `atomic_` prefix.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>

> +/// - `atomic_store(.., Relaxed)` maps to `WRITE_ONCE()` when using for inter-thread communication.

typo: "when used for"

Alice