linux-kernel - Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node

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Message-Id: <20070207212727.6aacb0b4.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 7 Feb 2007 21:27:27 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, y-goto@...fujitsu.com,
	clameter@...r.sgi.com, akpm@...l.org
Subject: Re: [2.6.20][PATCH] fix mempolicy error check on a system with
 memory-less-node

On Wed, 7 Feb 2007 12:32:36 +0100
Andi Kleen <ak@...e.de> wrote:

> 
> > How for_each_online_node(nid) works ? it can handle alias-nid ?
> > 
> > ==
> > 	for_each_online_node(nid) {
> > 		pgdat = NODE_DATA(nid);
> > ==
> > This code never accesses pgdat_for_A twice ?
> 
> It would. If there's a problem it could be changed to walk the pgdat lists instead,
> but at least when x86-64 still did it there wasn't.
> 

Thank you for discussion. 

I'll try another hot-fix just for this NULL pointer access problem,
which is not invasive and not costly.

Thanks,
-Kame


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