Re: [PATCH v3 1/8] atomics: add acquire/release/relaxed variants of some atomic operations

[Peter Zijlstra]

On Mon, Jul 27, 2015 at 05:33:00PM +0100, Will Deacon wrote:
> Something like below?
> 
> Will
> 
> --->8
> 
> diff --git a/include/linux/atomic.h b/include/linux/atomic.h
> index 899b4035569e..d2515c05e7c8 100644
> --- a/include/linux/atomic.h
> +++ b/include/linux/atomic.h
> @@ -14,6 +14,11 @@
>   * - Release: Provides RELEASE semantics, _release suffix.
>   * - Relaxed: No ordering guarantees, _relaxed suffix.
>   *
> + * For compound atomics performing both a load and a store, ACQUIRE
> + * semantics apply only to the load and RELEASE semantics only to the
> + * store portion of the operation. Note that a failed cmpxchg_acquire
> + * does -not- imply any memory ordering constraints.
> + *
>   * See Documentation/memory-barriers.txt for ACQUIRE/RELEASE definitions.
>   */

Yep, works for me.
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