[PATCH 0/4] Use folio APIs in procfs

[Matthew Wilcox (Oracle)]

Not sure whether Andrew or Christian will want to take this set of
fixes.  We're down to very few users of the PageFoo macros, with proc
being a major user.  After this patchset and another patchset I have
for khugepaged, we can get rid of PageActive, PageReadahead and
PageSwapBacked.

This patchset has the usual advantages in its own right of removing
hidden calls to compound_head().  We have the page table lock, so
the mapcount & refcount are stable and there can't be any races with
folios suddenly becoming tail pages.

Matthew Wilcox (Oracle) (4):
  proc: Convert gather_stats to use a folio
  proc: Convert smaps_page_accumulate to use a folio
  proc: Pass a folio to smaps_page_accumulate()
  proc: Convert smaps_pmd_entry to use a folio

 fs/proc/task_mmu.c | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

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2.43.0