[PATCH v4 0/4] A few cleanup and fixup patches for migration

[Miaohe Lin <linmiaohe@huawei.com>]

Hi everyone,
This series contains a few patches to remove unneeded lock page and
PageMovable check, reduce the rcu lock duration. Also we fix potential
pte_unmap on an not mapped pte. More details can be found in the
respective changelogs. Thanks!

---
v4:
  collect Reviewed-by tag of Oscar.
  fix build error reported by kernel test robot.
v3:
[PATCH 1/4] mm/migration: reduce the rcu lock duration
  add the analysis that the original race condition isn't possible now
  alsoreduce the rcu lock duration in kernel_migrate_pages
[PATCH 2/4] mm/migration: remove unneeded lock page and PageMovable check
  let free_pages_prepare() clear PG_isolated for us
[PATCH 3/4] mm/migration: return errno when isolate_huge_page failed
  rename isolate_huge_page to isolate_hugetlb
[PATCH 4/4] mm/migration: fix potential pte_unmap on an not mapped pte
  collect Reviewed-by tag
v2:
  collect Reviewed-by tag
  make isolate_huge_page consistent with isolate_lru_page
  add hugetlbfs variant of hugetlb_migration_entry_wait
v1:
  rebase [1] on mainline.

[1] https://lore.kernel.org/lkml/20220304093409.25829-2-linmiaohe@huawei.com/T/
---

Miaohe Lin (4):
  mm: reduce the rcu lock duration
  mm/migration: remove unneeded lock page and PageMovable check
  mm/migration: return errno when isolate_huge_page failed
  mm/migration: fix potential pte_unmap on an not mapped pte

 include/linux/hugetlb.h |  6 +++---
 include/linux/swapops.h | 12 ++++++++----
 mm/gup.c                |  2 +-
 mm/hugetlb.c            | 15 +++++++--------
 mm/memory-failure.c     |  2 +-
 mm/memory_hotplug.c     |  2 +-
 mm/mempolicy.c          |  5 ++---
 mm/migrate.c            | 42 +++++++++++++++++++++++++----------------
 8 files changed, 49 insertions(+), 37 deletions(-)

-- 
2.23.0