linux-kernel - Re: [thisops uV2 04/10] x86: Support for this_cpu_add,sub,dec,inc

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Date:	Mon, 29 Nov 2010 10:03:26 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	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>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [thisops uV2 04/10] x86: Support for
 this_cpu_add,sub,dec,inc_return

On Sat, 27 Nov 2010, Pekka Enberg wrote:

> On Fri, Nov 26, 2010 at 11:09 PM, Christoph Lameter <cl@...ux.com> wrote:
> > @@ -300,6 +339,14 @@ do {                                                                       \
> >  #define irqsafe_cpu_xor_2(pcp, val)    percpu_to_op("xor", (pcp), val)
> >  #define irqsafe_cpu_xor_4(pcp, val)    percpu_to_op("xor", (pcp), val)
> >
> > +#ifndef CONFIG_M386
>
> Use CONFIG_X86_32 here?

This is a section specifically for non 386. 386 does not support certain
atomic operations.