[PATCH RFC v2 0/3] mm: Properly document tail pages for a folio

[Peter Xu <peterx@redhat.com>]

rfcv1: https://lore.kernel.org/r/20230810204944.53471-1-peterx@redhat.com

This is rfcv2 of the patch, where I split two small changes out from the
last patch.  Please refer to each patch for details.  The goal of the
series is to document clearly on how the fields in struct folio is reused
over tail pages, and make it clear on what can still be reused as free.

Smoke tested on x86_64 only, kernel-doc should have no change.

Comments welcomed.  Thanks.

Peter Xu (3):
  mm: Add TAIL_MAPPING_REUSED_MAX
  mm: Reorg and declare free spaces in struct folio tails
  mm: Proper document tail pages fields for folio

 include/linux/mm_types.h | 60 ++++++++++++++++++++++++++++++++++++----
 mm/huge_memory.c         |  6 ++--
 2 files changed, 58 insertions(+), 8 deletions(-)

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2.41.0