Changelog:
v5 - v4
        - Fixed the issue that was reported on ppc64 when
          CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER is removed
        - Consolidated the new buffer allocation between vmemmap
          and non-vmemmap variants of sparse layout.
        - Removed all review-by comments, because I had to do
          significant amount of changes compared to previous version
          and need another round of review.
        - I also would appreciate if those who reported problems with
          PPC64 could test this change.
v4 - v3
        - Addressed comments from Dave Hansen
v3 - v1
        - Fixed two issues found by Baoquan He
v1 - v2
        - Addressed comments from Oscar Salvador

In sparse_init() we allocate two large buffers to temporary hold usemap and
memmap for the whole machine. However, we can avoid doing that if we
changed sparse_init() to operated on per-node bases instead of doing it on
the whole machine beforehand.

As shown by Baoquan
http://lkml.kernel.org/r/20180628062857.29658-1-...@redhat.com

The buffers are large enough to cause machine stop to boot on small memory
systems.

Another benefit of these changes is that they also obsolete
CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER.

Pavel Tatashin (5):
  mm/sparse: abstract sparse buffer allocations
  mm/sparse: use the new sparse buffer functions in non-vmemmap
  mm/sparse: move buffer init/fini to the common place
  mm/sparse: add new sparse_init_nid() and sparse_init()
  mm/sparse: delete old sprase_init and enable new one

 include/linux/mm.h  |   7 +-
 mm/Kconfig          |   4 -
 mm/sparse-vmemmap.c |  59 +--------
 mm/sparse.c         | 300 +++++++++++++++-----------------------------
 4 files changed, 105 insertions(+), 265 deletions(-)

-- 
2.18.0

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