linux-kernel - Re: SNB PCI root information

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Message-ID: <CAOPLpQfRSOm4mYFciDky9XqZdb+7nG29ZxR0CpVFzNsnPiPO7w@mail.gmail.com>
Date:	Wed, 20 Jun 2012 17:21:51 -0400
From:	Ulrich Drepper <drepper@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Yinghai Lu <yinghai@...nel.org>,
	jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

On Wed, Jun 20, 2012 at 4:16 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> It's not a question of "do BIOSes get this wrong?"  The question is
> "what does a user expect to happen when she supplies
> 'pci=busnum_node=00:00,80:01'?"  I contend that the user expects us to
> use that info whether the BIOS gave us correct info, wrong info, or
> nothing at all.

Think about busnum_node as busnum_default_node.  Then the behavior
makes perfect sense.

I contend that the really the only reason for overwriting is if there
are wrong BIOS.
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