[PATCH v2 0/3] userfaultfd: convert userfaultfd functions to use folios

[Peng Zhang <zhangpeng362@huawei.com>]

From: ZhangPeng <zhangpeng362@huawei.com>

This patch series converts several userfaultfd functions to use folios.
And this series pass the userfaultfd selftests and the LTP userfaultfd
test cases.

Change log:

v1->v2:
In patch 2:
- Rename copy_large_folio_from_user() to copy_folio_from_user().
- Delete the inner_folio.
- kmap() and kmap_atomic() are converted to kmap_local_page(). Use
  pagefault_disable() to ensure that a deadlock will not occur.
- flush_dcache_folio() is placed outside the loop.

ZhangPeng (3):
  userfaultfd: convert mcopy_atomic_pte() to use a folio
  userfaultfd: convert __mcopy_atomic_hugetlb() to use a folio
  userfaultfd: convert __mcopy_atomic() to use a folio

 include/linux/hugetlb.h  |  4 +--
 include/linux/mm.h       |  3 +-
 include/linux/shmem_fs.h |  2 +-
 mm/hugetlb.c             | 25 +++++++-------
 mm/memory.c              | 27 +++++++--------
 mm/shmem.c               | 17 +++++----
 mm/userfaultfd.c         | 74 +++++++++++++++++++---------------------
 7 files changed, 72 insertions(+), 80 deletions(-)

-- 
2.25.1