linux-kernel - Re: [regression] 3.0-rc boot failure -- bisected to cd4ea6ae3982

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Date:	Wed, 20 Jul 2011 12:45:08 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Anton Blanchard <anton@...ba.org>
Cc:	mahesh@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, mingo@...e.hu,
	benh@...nel.crashing.org, torvalds@...ux-foundation.org
Subject: Re: [regression] 3.0-rc boot failure -- bisected to cd4ea6ae3982

On Wed, 2011-07-20 at 20:14 +1000, Anton Blanchard wrote:

> > That looks very strange indeed.. up to node 23 there is the normal
> > symmetric matrix with all the trace elements on 10 (as we would expect
> > for local access), and some 4x4 sub-matrix stacked around the trace
> > with 20, suggesting a single hop distance, and the rest on 40 being
> > out-there.
> 
> I retested with the latest version of numactl, and get correct results.

One less thing to worry about ;-)

> I worked out why the patches don't boot, we weren't allocating any
> space for the cpumask and ran off the end of the allocation.

Gah! that's not the first time I made that particular mistake :/

> Should we also use cpumask_copy instead of open coding it? I added that
> too.

Probably, I looked for cpumask_assign() and on failing to find that used
the direct assignment.

So with that fix the patch makes the machine happy again?

Thanks!
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