From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and
 improve lpage NUMA support
Date: Mon, 29 Jun 2009 16:39:37 -0700
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To: Christoph Lameter <cl@linux-foundation.org>
Cc: tj@kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org, mingo@elte.hu, andi@firstfloor.org, hpa@zytor.com, tglx@linutronix.de

On Mon, 29 Jun 2009 19:20:53 -0400 (EDT)
Christoph Lameter <cl@linux-foundation.org> wrote:

> On Wed, 24 Jun 2009, Andrew Morton wrote:
> 
> > I assume from the tremendous number of for_each_possible_cpu()s that
> > CPU hotplug awareness won't be happening.
> 
> Per cpu areas are allocated for all possible processors. No need to handle
> offlining and onlining them.

Well yes.  My point is that this is a bug-not-a-feature ;)