mm-sparse-drop-pgdat_resize_lock-in-sparse_add-remove_one_section-v4

mm-sparse-drop-pgdat_resize_lock-in-sparse_add-remove_one_section-v4

v4:
   * fix typo in changelog
   * adjust second paragraph of changelog
v3:
   * adjust the changelog with the reason for this change
   * remove a comment for pgdat_resize_lock
   * separate the prototype change of sparse_add_one_section() to
     another one

Link: http://lkml.kernel.org/r/20181204085657.20472-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>