Rename page_copy_prealloc() to folio_prealloc(), which is used by
more functions, also do more folio conversion in page fault.

v2:
- add folio_test_large check in ksm_might_need_to_copy() and
  replace page->index to folio->index, per David, Matthew
- Add RB of Sidhartha

Kefeng Wang (6):
  mm: ksm: use more folio api in ksm_might_need_to_copy()
  mm: memory: use a folio in validate_page_before_insert()
  mm: memory: rename page_copy_prealloc() to folio_prealloc()
  mm: memory: use a folio in do_cow_page()
  mm: memory: use folio_prealloc() in wp_page_copy()
  mm: memory: use folio_prealloc() in do_anonymous_page()

 include/linux/ksm.h |  4 +--
 mm/ksm.c            | 39 ++++++++++++------------
 mm/memory.c         | 72 +++++++++++++++++++--------------------------
 3 files changed, 53 insertions(+), 62 deletions(-)

-- 
2.27.0