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From: Ulrich Drepper <drepper@gmail.com>
Date: Mon, 18 Jun 2012 18:30:21 -0400
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Subject: Re: SNB PCI root information
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Yinghai Lu <yinghai@kernel.org>, jbarnes@virtuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	lenb@kernel.org, x86@kernel.org, linux-pci@vger.kernel.org
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On Sat, Jun 16, 2012 at 5:56 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> If ACPI provides a perfectly usable generic way to describe this
> topology and the vendor BIOS doesn't bother to use it, I'm not very
> interested in trying to compensate for that BIOS deficiency by adding
> a bunch of non-portable CPU-specific gunk to Linux.

The problem is that all machines get this wrong.  I've tested varies
models from Dell and HP and none of them have the _PXM entry and the
local_cpus fields are wrong.  If there is a reasonably sane way to
compensate for broken BIOSes it should be considered.  We all know how
good BIOS authors are...