Date: Thu, 9 Feb 2006 10:04:29 -0800
From: Andrew Morton <akpm@osdl.org>
To: Ashok Raj <ashok.raj@intel.com>
Cc: ntl@pobox.com, dada1@cosmosbay.com, riel@redhat.com,
       linux-kernel@vger.kernel.org, torvalds@osdl.org, mingo@elte.hu,
       ak@muc.de, 76306.1226@compuserve.com, wli@holomorphy.com,
       heiko.carstens@de.ibm.com, pj@sgi.com
Subject: Re: [PATCH] percpu data: only iterate over possible CPUs
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Ashok Raj <ashok.raj@intel.com> wrote:
>
> The problem was with ACPI just simply looking at the namespace doesnt
>  exactly give us an idea of how many processors are possible in this platform.

We need to fix this asap - the performance penalty for HOTPLUG_CPU=y,
NR_CPUS=lots will be appreciable.

Do any x86 platforms actually support CPU hotplug?

Does the ACPI problem which you describe occur with present-CPUs,
or only with possible-but-not-present ones?
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