linux-kernel - Re: [PATCH 07/11] Memory compaction core

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Message-ID: <20100324145946.372f3f31@bike.lwn.net>
Date:	Wed, 24 Mar 2010 14:59:46 -0600
From:	Jonathan Corbet <corbet@....net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 07/11] Memory compaction core

On Wed, 24 Mar 2010 13:33:47 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> > +	VM_BUG_ON(cc == NULL);  
> 
> It's a bit strange to test this when we're about to oops anyway.  The
> oops will tell us the same thing.

...except that we've seen a fair number of null pointer dereference
exploits that have told us something altogether different.  Are we
*sure* we don't want to test for null pointers...?

jon
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