linux-kernel - Re: [PATCH v5 05/10] rust: sync: atomic: Add atomic {cmp,}xchg operations

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Message-ID: <aGKs_21dK7y50fxh@tardis-2.local>
Date: Mon, 30 Jun 2025 08:27:59 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Benno Lossin <lossin@...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>,
	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>
Subject: Re: [PATCH v5 05/10] rust: sync: atomic: Add atomic {cmp,}xchg
 operations

On Mon, Jun 30, 2025 at 08:24:13AM -0700, Boqun Feng wrote:
[...]
> 
> Make senses, so added:
> 
> --- a/rust/kernel/sync/atomic/generic.rs
> +++ b/rust/kernel/sync/atomic/generic.rs
> @@ -310,7 +310,7 @@ impl<T: AllowAtomic> Atomic<T>
>      /// assert_eq!(42, x.xchg(52, Acquire));
>      /// assert_eq!(52, x.load(Relaxed));
>      /// ```
> -    #[doc(alias("atomic_xchg", "atomic64_xchg"))]
> +    #[doc(alias("atomic_xchg", "atomic64_xchg", "swap"))]
>      #[inline(always)]
>      pub fn xchg<Ordering: Any>(&self, v: T, _: Ordering) -> T {
>          let v = T::into_repr(v);
> @@ -382,6 +382,7 @@ pub fn xchg<Ordering: Any>(&self, v: T, _: Ordering) -> T {
>          "atomic64_cmpxchg",
>          "atomic_try_cmpxchg",
>          "atomic64_try_cmpxchg"

Missing a comma here, fixed locally.

Regards,
Boqun

> +        "compare_exchange"
>      ))]
>      #[inline(always)]
>      pub fn cmpxchg<Ordering: Any>(&self, mut old: T, new: T, o: Ordering) -> Result<T, T> {
> 
> Seems good?
> 
> Regards,
> Boqun