[PATCH v3 00/15] HWPOISON: soft offline rework

[nao . horiguchi]

I rebased soft-offline rework patchset [1][2] onto the latest mmotm.  The
rebasing required some non-trivial changes to adjust, but mainly that was
straightforward.  I confirmed that the reported problem doesn't reproduce on
compaction after soft offline.  For more precise description of the problem
and the motivation of this patchset, please see [2].

I think that the following two patches in v2 are better to be done with
separate work of hard-offline rework, so it's not included in this series.

  - mm,hwpoison: Take pages off the buddy when hard-offlining
  - mm/hwpoison-inject: Rip off duplicated checks

These two are not directly related to the reported problem, so they seems
not urgent.  And the first one breaks num_poisoned_pages counting in some
testcases, and The second patch needs more consideration about commented point.

Any comment/suggestion/help would be appreciated.

[1] v1: https://lore.kernel.org/linux-mm/1541746035-13408-1-git-send-email-n-horiguchi@xxxxxxxxxxxxx/
[2] v2: https://lore.kernel.org/linux-mm/20191017142123.24245-1-osalvador@xxxxxxx/

Thanks,
Naoya Horiguchi
---
Summary:

Naoya Horiguchi (7):
      mm,hwpoison: cleanup unused PageHuge() check
      mm, hwpoison: remove recalculating hpage
      mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED
      mm,hwpoison-inject: don't pin for hwpoison_filter
      mm,hwpoison: remove MF_COUNT_INCREASED
      mm,hwpoison: remove flag argument from soft offline functions
      mm,hwpoison: introduce MF_MSG_UNSPLIT_THP

Oscar Salvador (8):
      mm,madvise: Refactor madvise_inject_error
      mm,hwpoison: Un-export get_hwpoison_page and make it static
      mm,hwpoison: Kill put_hwpoison_page
      mm,hwpoison: Unify THP handling for hard and soft offline
      mm,hwpoison: Rework soft offline for free pages
      mm,hwpoison: Rework soft offline for in-use pages
      mm,hwpoison: Refactor soft_offline_huge_page and __soft_offline_page
      mm,hwpoison: Return 0 if the page is already poisoned in soft-offline

 drivers/base/memory.c      |   2 +-
 include/linux/mm.h         |  12 +-
 include/linux/page-flags.h |   6 +-
 include/ras/ras_event.h    |   3 +
 mm/hwpoison-inject.c       |  18 +--
 mm/madvise.c               |  39 +++---
 mm/memory-failure.c        | 331 ++++++++++++++++++++-------------------------
 mm/migrate.c               |  11 +-
 mm/page_alloc.c            |  63 +++++++--
 9 files changed, 233 insertions(+), 252 deletions(-)