This patch series aims to fix some bugs and add some improvements.

Changelog since v1 -> v2:
  - Export set_page_huge_active() in patch #2 to fix.
  - Using head[3].mapping to indicate the page is freed in patch #3.
  - Flush @free_hpage_work in patch #4.

Muchun Song (6):
  mm: migrate: do not migrate HugeTLB page whose refcount is one
  mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page
  mm: hugetlb: fix a race between freeing and dissolving the page
  mm: hugetlb: add return -EAGAIN for dissolve_free_huge_page
  mm: hugetlb: fix a race between isolating and freeing page
  mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active

 fs/hugetlbfs/inode.c    |  3 ++-
 include/linux/hugetlb.h |  2 ++
 mm/hugetlb.c            | 69 +++++++++++++++++++++++++++++++++++++++++++------
 mm/migrate.c            |  6 +++++
 4 files changed, 71 insertions(+), 9 deletions(-)

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2.11.0