From: Linus Torvalds <torvalds@osdl.org>
Subject: Re: [discuss] Re: 2.6.19-rc4: known unfixed regressions
	(v3)
Date: Wed, 8 Nov 2006 08:05:18 -0800 (PST)
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Cc: Andrew Morton <akpm@osdl.org>, len.brown@intel.com,
   Thierry Vignaud <tvignaud@mandriva.com>, linux-pm@osdl.org,
   Ernst Herzberg <earny@net4u.de>, Aaron Durbin <adurbin@google.com>,
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   Tim Chen <tim.c.chen@linux.intel.com>, phil.el@wanadoo.fr, gregkh@suse.de,
   Andi Kleen <ak@suse.de>, Adrian Bunk <bunk@stusta.de>,
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   "Eric W. Biederman" <ebiederm@xmission.com
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To: Matthew Wilcox <matthew@wil.cx>
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On Wed, 8 Nov 2006, Matthew Wilcox wrote:
>
> On Wed, Nov 08, 2006 at 08:39:44AM +0100, Andi Kleen wrote:
> > ACPI knows the number of busses.
> =

> But what if the number of busses increases later, eg by hotplugging
> a card with a PCI-PCI bridge on it?  Or does it know the number of
> busses which can be supported by this machine's MMCONFIG region?

ACPI will give the maximum number.

However, in this case, the correct thing to do (always _has_ been) is to =

not use ACPI for _anything_, but just read the base and the size of the =

MMCONFIG region from the hardware itself.

Anyway, I do not consider this a regression. MMCONFIG has _never_ worked =

reliably. It has always been a case of "we can make it work on some =

machines by making it break on others".

			Linus