[PATCH] new radeon memory map fixes (#3)

[Benjamin Herrenschmidt]

> > Can you try all combinations of my old patch, new patch, X patch & !X
> > patch and let me know what the results are ?
> 
> If it's perfectly stable with your latest patch and without that one bad
> Mesa patch, would that convince you it's not a bug in DRM/DDX? :)

Well, I'm navigating between lots of conflicting reports so yes, any
"solid" data like that would be very useful. Also, is it stable if not
using 3d ?

Thanks,
Ben.