linux-kernel - Re: [cpuops cmpxchg double V1 2/4] x86: this_cpu_cmpxchg

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Message-ID: <alpine.DEB.2.00.1012151040150.12470@router.home>
Date:	Wed, 15 Dec 2010 10:41:01 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Tejun Heo <tj@...nel.org>, akpm@...ux-foundation.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [cpuops cmpxchg double V1 2/4] x86: this_cpu_cmpxchg_double()
 support

On Wed, 15 Dec 2010, H. Peter Anvin wrote:

> Yes, that's what I meant... the code is correct, it's just not obvious
> from someone who looks at the code that it is correct, because the
> intended function of the code isn't obvious from that file by itself (in
> fact, it looks almost exactly like the 486 cmpxchg ersatz code.)

Confirmed. It is a copy of that 486 ersatz code ... But its ok for the use
case here.


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