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vmemmap is forcefully set to start at MAX_PHYSMEM_BITS at most.
That could be needed in the past to limit ident_map_size to
MAX_PHYSMEM_BITS. However since commit 75eba6ec0de1 ("s390:
unify identity mapping limits handling") ident_map_size is
limited in setup_ident_map_size() function, which is called
earlier.
Another reason to limit vmemmap start to MAX_PHYSMEM_BITS is
because it was returned by arch_get_mappable_range() as the
maximum mappable physical address. Since commit f641679dfe55
("s390/mm: rework arch_get_mappable_range() callback") that
is not required anymore.
As result, there is no neccessity to limit vmemmap starting
address with MAX_PHYSMEM_BITS.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
47bf817672