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

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Message-ID: <20150727091430.GP19282@twins.programming.kicks-ass.net>
Date:	Mon, 27 Jul 2015 11:14:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-arch@...r.kernel.org, Waiman.Long@...com,
	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH v3 1/8] atomics: add acquire/release/relaxed variants of
 some atomic operations

On Fri, Jul 24, 2015 at 03:04:34PM +0100, Will Deacon wrote:

> This patch introduces three new ordering semantics for these operations:
> 
>   - *_relaxed: No ordering guarantees. This is similar to what we have
>                already for the non-return atomics (e.g. atomic_add).
> 
>   - *_acquire: ACQUIRE semantics, similar to smp_load_acquire.
> 
>   - *_release: RELEASE semantics, similar to smp_store_release.

Do we want to further specify that for the RmW operations the Read/load
will provide the acquire and the Write/store the release?


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