linux-kernel - Re: [RFC] [PATCH] cpuset operations causes Badness at mm/slab.c:777 warning

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Message-ID: <Pine.LNX.4.64.0706011823470.10720@schroedinger.engr.sgi.com>
Date:	Fri, 1 Jun 2007 18:24:53 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Valdis.Kletnieks@...edu
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Srinivasa Ds <srinivasa@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Dinakar Guniguntala <dino@...ibm.com>, pj@....com,
	simon.derr@...l.net, clameter@...ulhu.engr.sgi.com,
	rientjes@...gle.com
Subject: Re: [RFC] [PATCH] cpuset operations causes Badness at mm/slab.c:777
 warning

On Fri, 1 Jun 2007, Valdis.Kletnieks@...edu wrote:

> On Fri, 01 Jun 2007 16:00:30 PDT, Linus Torvalds said:
> 
> > 	#define BADPTR ((void *)16)
> 
> > I bet you'd find *more* problems that way than by returning NULL, and 
> > you'd also avoid the whole problem with "if (!ptr) return -ENOMEM".
> 
> Hmm.. this looks like a good contender for "first usage of #ifndef CONFIG_STABLE"

The warning? Sure but the BADPTR (or ZERO_SIZE_PTR now) will stay. 
It is definitely an error to deference an object that has no size.

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