linux-kernel - Re: [PATCH] arch/x86/mm/numa.c: quiet sparse noise when CONFIG_X86

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Date:	Sun, 11 Sep 2011 10:06:19 +0900
From:	Tejun Heo <tj@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, x86@...nel.org,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	penberg@...nel.org, yinghai@...nel.org
Subject: Re: [PATCH] arch/x86/mm/numa.c: quiet sparse noise when
 CONFIG_X86_64 is not set

Hello,

On Sat, Sep 10, 2011 at 02:39:02AM -0700, David Rientjes wrote:
> On Fri, 9 Sep 2011, H Hartley Sweeten wrote:
> 
> > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> > index fbeaaf4..11c60a7 100644
> > --- a/arch/x86/mm/numa.c
> > +++ b/arch/x86/mm/numa.c
> > @@ -455,6 +455,7 @@ void __init numa_set_distance(int from, int to, int distance)
> >  	numa_distance[from * numa_distance_cnt + to] = distance;
> >  }
> >  
> > +#ifdef CONFIG_X86_64
> >  int __node_distance(int from, int to)
> >  {
> >  	if (from >= numa_distance_cnt || to >= numa_distance_cnt)
> > @@ -462,6 +463,7 @@ int __node_distance(int from, int to)
> >  	return numa_distance[from * numa_distance_cnt + to];
> >  }
> >  EXPORT_SYMBOL(__node_distance);
> > +#endif
> >  
> >  /*
> >   * Sanity check to catch more bad NUMA configurations (they are amazingly
> > 
> 
> What is 64-bit specific about this function?  Shouldn't we be defining it 
> to be node_distance for all of x86?

Yeap, that's a remnant of the old separate code paths, which wasn't
discovered because asm-generic/topology.h defines fallback
node_distance() automatically.  We should drop #ifdef from
arch/x86/include/asm/topology.h::node_distance().  Hartley, can you
please send a patch to do that?

Thanks.

-- 
tejun
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