mm/memory_hotplug: handle memblocks only with CONFIG_ARCH_KEEP_MEMBLOCK

The comment in add_memory_resource() is stale: hotadd_new_pgdat() will no
longer call get_pfn_range_for_nid(), as a hotadded pgdat will simply span
no pages at all, until memory is moved to the zone/node via
move_pfn_range_to_zone() - e.g., when onlining memory blocks.

The only archs that care about memblocks for hotplugged memory (either for
iterating over all system RAM or testing for memory validity) are arm64,
s390x, and powerpc - due to CONFIG_ARCH_KEEP_MEMBLOCK.  Without
CONFIG_ARCH_KEEP_MEMBLOCK, we can simply stop messing with memblocks.

Signed-off-by: David Hildenbrand <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Mike Rapoport <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Pankaj Gupta <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions