----- Original Message -----
 
 
 SLES11:/opt/kdump # nm -Bn vmlinux | grep -e ffffffff806f7360 -e
 ffffffff80674690
 ffffffff80674690 B phys_to_machine_mapping
 ffffffff806f7360 B max_pfn
 
 ffffffff806f7360 should be "end_pfn" or "max_pfn", you are right!
OK, so this is one of the "old" pre-pvops paravirtualized kernels,
which had the separate Xen kernel patch applied to a base kernel.
In that case, yes, it would look for "phys_to_machine_mapping" 
instead of "p2m_top".
Dave