linux-kernel - Re: [PATCH] Fix sys_move_pages when a NULL node list is passed.

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Message-Id: <20061108111341.748d034a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 8 Nov 2006 11:13:41 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	sfr@...b.auug.org.au, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, stable@...nel.org, akpm@...l.org
Subject: Re: [PATCH] Fix sys_move_pages when a NULL node list is passed.

On Tue, 7 Nov 2006 18:01:11 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:

> On Wed, 8 Nov 2006, KAMEZAWA Hiroyuki wrote:
> 
> > >  	pm[nr_pages].node = MAX_NUMNODES;
> > 
> > I think node0 is always online...but this should be
> > 
> > pm[i].node = first_online_node; // /* any online node */
> 
> No it is a marker. The use of any node that is online could lead to a 
> false determination of the endpoint of the list.
> 
Ah.. I'm mentioning to this.
==
+			pm[i].node = 0;	/* anything to not match MAX_NUMNODES */
==
Sorry for my bad cut & paste.

It seems that this 0 will be passed to alloc_pages_node().
alloc_pages_node() doesn't check whether a node is online or not before using 
NODE_DATA().

-Kame

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