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[Xen-devel] Move MEMZONE_XEN to the last



Zone index for domain heap is derived from bits, while zone index for 
xen heap takes 0 to catch all. This looks a bit messed which prevents 
future extension. For example, if Xen can be located at higher memory:
        - The assumption that domheap starts from MEMZONE_XEN+1 
doesn't hold true
        - The memory within the very bit but out of xenheap can't be 
claimed by domheap since that bit belongs to xenheap exclusively

So how about moving MEMZONE_XEN to the last 
(current NR_ZONES plus 1)? That can ensure domheap covering all
possible bits exactly. 

Thanks,
Kevin

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