[PATCH v2 0/3] hold PTL for several .hugetlb_entry callbacks

[Jinjiang Tu <tujinjiang@huawei.com>]

Changelog since v1:
 * update the subject pacth #1
 * add patch #2 and #3 to hold PTL for some other .hugetlb_entry callbacks

Patch #1 fixes a race between smaps_hugetlb_range() and migration by holding
PTL in smaps_hugetlb_range().

To avoid operating on stale pages, add PTL for several .hugetlb_entry
callbacks too. We don't hold PTL in __s390_enable_skey_hugetlb() and
prot_none_hugetlb_entry(), since the mmap write lock is held. We don't
hold PTL in hwpoison_hugetlb_range() too, since it only reads the pte and
doesn't operate the page.

Jinjiang Tu (3):
  mm/smaps: fix race between smaps_hugetlb_range and migration
  fs/proc/task_mmu: hold PTL in pagemap_hugetlb_range and
    gather_hugetlb_stats
  mm/mincore: hold PTL in mincore_hugetlb

 fs/proc/task_mmu.c | 20 ++++++++++++++++----
 mm/mincore.c       |  3 +++
 2 files changed, 19 insertions(+), 4 deletions(-)

-- 
2.43.0