[00/22] Get rid of first tail page fields

Message

Matthew Wilcox Dec. 31, 2022, 9:45 p.m. UTC

Continue the shrinkage of the struct page definition by getting rid of the
'first tail page' fields.  I originally did this patch set before Hugh's
rewrite of the subpages_mapcount, so it needed substantial updates;
hope I didn't miss anything.

I hope you like the new names for compound_mapcount and
subpages_mapcount.

Matthew Wilcox (Oracle) (22):
  mm: Remove folio_pincount_ptr() and head_compound_pincount()
  mm: Convert head_subpages_mapcount() into folio_nr_pages_mapped()
  doc: Clarify refcount section by referring to folios & pages
  mm: Convert total_compound_mapcount() to folio_total_mapcount()
  mm: Convert page_remove_rmap() to use a folio internally
  mm: Convert page_add_anon_rmap() to use a folio internally
  mm: Convert page_add_file_rmap() to use a folio internally
  mm: Add folio_add_new_anon_rmap()
  page_alloc: Use folio fields directly
  mm: Use a folio in hugepage_add_anon_rmap() and
    hugepage_add_new_anon_rmap()
  mm: Use entire_mapcount in __page_dup_rmap()
  mm/debug: Remove call to head_compound_mapcount()
  hugetlb: Remove uses of folio_mapcount_ptr
  mm: Convert page_mapcount() to use folio_entire_mapcount()
  mm: Remove head_compound_mapcount() and _ptr functions
  mm: Reimplement compound_order()
  mm: Reimplement compound_nr()
  mm: Convert set_compound_page_dtor() and set_compound_order() to
    folios
  mm: Convert is_transparent_hugepage() to use a folio
  mm: Convert destroy_large_folio() to use folio_dtor
  hugetlb: Remove uses of compound_dtor and compound_nr
  mm: Remove 'First tail page' members from struct page

 Documentation/core-api/pin_user_pages.rst |  29 ++--
 Documentation/mm/transhuge.rst            |  18 +--
 include/linux/mm.h                        | 141 ++++++++----------
 include/linux/mm_types.h                  |  53 +------
 include/linux/rmap.h                      |  11 +-
 kernel/crash_core.c                       |   4 +-
 mm/debug.c                                |   8 +-
 mm/folio-compat.c                         |   8 ++
 mm/gup.c                                  |   8 +-
 mm/huge_memory.c                          |  12 +-
 mm/hugetlb.c                              |  24 ++--
 mm/internal.h                             |  18 +++
 mm/page_alloc.c                           |  23 +--
 mm/rmap.c                                 | 167 +++++++++++-----------
 14 files changed, 250 insertions(+), 274 deletions(-)