MM folio changes for 6.1

My focus this round has been on shmem.  I believe it is now fully
converted to folios.  Of course, shmem interacts with a lot of the swap
cache and other parts of the kernel, so there are patches all over the MM.

This patch series survives a round of xfstests on tmpfs, which is nice,
but hardly an exhaustive test.  Hugh was nice enough to run a round of
tests on it and found a bug which is fixed in this edition.

Also new in this edition is the addition of
  mm: Convert lock_page_or_retry() to folio_lock_or_retry()
which I inadvertently left out of the first round of patches.  I adjusted
the shmem_replace_page() patch to apply on top of 76d36dea0269.

Matthew Wilcox (Oracle) (57):
  mm/vmscan: Fix a lot of comments
  mm: Add the first tail page to struct folio
  mm: Reimplement folio_order() and folio_nr_pages()
  mm: Add split_folio()
  mm: Add folio_add_lru_vma()
  shmem: Convert shmem_writepage() to use a folio throughout
  shmem: Convert shmem_delete_from_page_cache() to take a folio
  shmem: Convert shmem_replace_page() to use folios throughout
  mm/swapfile: Remove page_swapcount()
  mm/swapfile: Convert try_to_free_swap() to folio_free_swap()
  mm/swap: Convert __read_swap_cache_async() to use a folio
  mm/swap: Convert add_to_swap_cache() to take a folio
  mm/swap: Convert put_swap_page() to put_swap_folio()
  mm: Convert do_swap_page() to use a folio
  mm: Convert do_swap_page()'s swapcache variable to a folio
  memcg: Convert mem_cgroup_swapin_charge_page() to
    mem_cgroup_swapin_charge_folio()
  shmem: Convert shmem_mfill_atomic_pte() to use a folio
  shmem: Convert shmem_replace_page() to shmem_replace_folio()
  swap: Add swap_cache_get_folio()
  shmem: Eliminate struct page from shmem_swapin_folio()
  shmem: Convert shmem_getpage_gfp() to shmem_get_folio_gfp()
  shmem: Convert shmem_fault() to use shmem_get_folio_gfp()
  shmem: Convert shmem_read_mapping_page_gfp() to use
    shmem_get_folio_gfp()
  shmem: Add shmem_get_folio()
  shmem: Convert shmem_get_partial_folio() to use shmem_get_folio()
  shmem: Convert shmem_write_begin() to use shmem_get_folio()
  shmem: Convert shmem_file_read_iter() to use shmem_get_folio()
  shmem: Convert shmem_fallocate() to use a folio
  shmem: Convert shmem_symlink() to use a folio
  shmem: Convert shmem_get_link() to use a folio
  khugepaged: Call shmem_get_folio()
  userfaultfd: Convert mcontinue_atomic_pte() to use a folio
  shmem: Remove shmem_getpage()
  swapfile: Convert try_to_unuse() to use a folio
  swapfile: Convert __try_to_reclaim_swap() to use a folio
  swapfile: Convert unuse_pte_range() to use a folio
  mm: Convert do_swap_page() to use swap_cache_get_folio()
  mm: Remove lookup_swap_cache()
  swap_state: Convert free_swap_cache() to use a folio
  swap: Convert swap_writepage() to use a folio
  mm: Convert do_wp_page() to use a folio
  huge_memory: Convert do_huge_pmd_wp_page() to use a folio
  madvise: Convert madvise_free_pte_range() to use a folio
  uprobes: Use folios more widely in __replace_page()
  ksm: Use a folio in replace_page()
  mm: Convert do_swap_page() to use folio_free_swap()
  memcg: Convert mem_cgroup_swap_full() to take a folio
  mm: Remove try_to_free_swap()
  rmap: Convert page_move_anon_rmap() to use a folio
  migrate: Convert __unmap_and_move() to use folios
  migrate: Convert unmap_and_move_huge_page() to use folios
  huge_memory: Convert split_huge_page_to_list() to use a folio
  huge_memory: Convert unmap_page() to unmap_folio()
  mm: Convert page_get_anon_vma() to folio_get_anon_vma()
  rmap: Remove page_unlock_anon_vma_read()
  uprobes: Use new_folio in __replace_page()
  mm: Convert lock_page_or_retry() to folio_lock_or_retry()

 include/linux/huge_mm.h    |   5 +
 include/linux/memcontrol.h |   4 +-
 include/linux/mm.h         |  12 +-
 include/linux/mm_types.h   |  30 ++-
 include/linux/pagemap.h    |   9 +-
 include/linux/rmap.h       |   7 +-
 include/linux/shmem_fs.h   |   6 +-
 include/linux/swap.h       |  35 ++--
 kernel/events/uprobes.c    |  28 +--
 mm/folio-compat.c          |   6 +
 mm/huge_memory.c           |  95 +++++-----
 mm/khugepaged.c            |   7 +-
 mm/ksm.c                   |   8 +-
 mm/madvise.c               |  49 ++---
 mm/memcontrol.c            |  21 +-
 mm/memory-failure.c        |   2 +-
 mm/memory.c                | 160 ++++++++--------
 mm/migrate.c               | 107 ++++++-----
 mm/page_io.c               |  21 +-
 mm/rmap.c                  |  33 ++--
 mm/shmem.c                 | 379 ++++++++++++++++++-------------------
 mm/swap.c                  |  19 +-
 mm/swap.h                  |  16 +-
 mm/swap_slots.c            |   2 +-
 mm/swap_state.c            | 111 +++++------
 mm/swapfile.c              | 159 ++++++++--------
 mm/truncate.c              |   2 +-
 mm/userfaultfd.c           |  14 +-
 mm/vmscan.c                | 259 +++++++++++++------------
 29 files changed, 816 insertions(+), 790 deletions(-)

-- 
2.35.1