linux-kernel - Re: [RFC v2 5/7] powerpc: atomic: Implement cmpxchg{,64}_* and atomic{,64}_cmpxchg

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Message-ID: <20151001171151.GW3816@twins.programming.kicks-ass.net>
Date:	Thu, 1 Oct 2015 19:11:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will.deacon@....com>,
	Waiman Long <waiman.long@...com>
Subject: Re: [RFC v2 5/7] powerpc: atomic: Implement cmpxchg{,64}_* and
 atomic{,64}_cmpxchg_* variants

On Thu, Oct 01, 2015 at 08:12:19AM -0700, Paul E. McKenney wrote:

> What C11 does is to allow the developer to specify different orderings
> on success and failure.  But it is no harder to supply a barrier (if
> needed) on the failure path, right?

Quite right.
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