linux-kernel - Re: [PATCH v2 7/7] ARM: atomics: define our SMP atomics in terms of

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Message-ID: <20150716210821.GC19282@twins.programming.kicks-ass.net>
Date:	Thu, 16 Jul 2015 23:08:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <waiman.long@...com>
Cc:	Will Deacon <will.deacon@....com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 7/7] ARM: atomics: define our SMP atomics in terms of
 _relaxed operations

On Thu, Jul 16, 2015 at 04:40:03PM -0400, Waiman Long wrote:
> On 07/16/2015 11:32 AM, Will Deacon wrote:
> >@@ -117,6 +115,8 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
> >  #error "SMP is not supported on this platform"

             ^^^^^^^^^^^^^

> >  #endif
> >
> >+#define xchg xchg_relaxed
> 
> Is that a typo? I think xchg() needs to be a full memory barrier.

Pointless on UP.
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