On Wed, Nov 08, 2006 at 08:05:18AM -0800, Linus Torvalds wrote:
>
>
> 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".
It is a serious regression:
The problem is that with the default CONFIG_PCI_GOANY, MMCONFIG is the
_first_ method tried.
In practice, this implies that nearly every system possibly affected
will suffer from a MMCONFIG breakage like the one Jeff observed...
> Linus
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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