Re: PCI memory allocation bug with CONFIG_HIGHMEM

[Andi Kleen]

> If you ahve a proper e820 map, then it should work correctly, with 
> anything that is RAM being marked as such (or being marked as "reserved").

Every e820 map i've seen did not have the AGP aperture marked reserved.
It is just an undescribed hole.  In fact when you mark the aperture in the
e820 map the Linux AGP driver stops working, it relies on it being
in an undescribed hole.

This means you cannot just reuse holes. And there is no other way to get
mapping space.

-Andi
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