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
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