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

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Message-ID: <Pine.LNX.4.64.0706011639520.9992@schroedinger.engr.sgi.com>
Date:	Fri, 1 Jun 2007 16:42:02 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	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, rientjes@...gle.com
Subject: Re: [RFC] [PATCH] cpuset operations causes Badness at mm/slab.c:777
 warning

On Fri, 1 Jun 2007, Linus Torvalds wrote:

> No, I don't think you can do it this way.

Ultimately not. But its worth to see if this works.

> At a minimum, you'd need to test that the result is word-aligned. 
> Preferably 8-byte aligned. We literally have stuff that knows about these 
> things and uses the low bits in the pointer to keep extra data.

kmalloc allocations are guaranteed to be aligned to KMALLOC_MINALIGN. I 
can bring that in but it will make the patch less readable.

> Of course, there migth be other (even more subtle) cases where we just 
> assume certain alignment, and depend on the fact that we just _happen_ to 
> get it. Who knows..

I tried to get rid of those cased and I hope that work is complete in 
2.6.22.

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