On Wed, 2011-09-21 at 18:26 +0200, Michal Nazarewicz wrote:

-               page += 1 << order;
+
+               if (zone_pfn_same_memmap(pfn - count, pfn))
+                       page += count;
+               else
+                       page = pfn_to_page(pfn);
        }

That all looks sane to me and should fix the bug I brought up.

-- Dave