[PATCH v2 0/3] mm,thp,rmap: rework the use of subpages_mapcount

[Hugh Dickins <hughd@google.com>]

Andrew, please replace the 1/3, 1/3 fix, 2/3, 3/3 in mm-unstable
by these v2 three: which incorporate the uninitialized warning fix,
and adjustments according to Kirill's review comments, plus his
Acks - I couldn't quite manage them just by -fixes.
No functional change from the v1 series.

1/3 mm,thp,rmap: subpages_mapcount of PTE-mapped subpages
2/3 mm,thp,rmap: subpages_mapcount COMPOUND_MAPPED if PMD-mapped
3/3 mm,thp,rmap: clean up the end of __split_huge_pmd_locked()

 Documentation/mm/transhuge.rst |  10 +-
 include/linux/mm.h             |  67 +++++++----
 include/linux/rmap.h           |  12 +-
 mm/huge_memory.c               |  15 +--
 mm/page_alloc.c                |   2 +-
 mm/rmap.c                      | 219 ++++++++++-------------------------
 6 files changed, 124 insertions(+), 201 deletions(-)

Thanks!
Hugh