[Patch v3 0/4] mm/huge_memory: cleanup __split_unmapped_folio()

[Wei Yang <richard.weiyang@gmail.com>]

This short patch series cleans up and optimizes the internal logic of
the __split_unmapped_folio() function.

The goal is to improve clarity and efficiency by eliminating redundant
checks, caching stable attribute values, and simplifying the iteration
logic used for updating folio statistics.

These changes make the code easier to follow and maintain.

The split_huge_page_test selftest pass.

v3:
  * only merge 4&5 in v1
  * refine the comment

v2:
  * merge patch 2-5
  * http://lkml.kernel.org/r/20251016004613.514-1-richard.weiyang@gmail.com

v1:
  * http://lkml.kernel.org/r/20251014134606.22543-1-richard.weiyang@gmail.com

Wei Yang (4):
  mm/huge_memory: avoid reinvoking folio_test_anon()
  mm/huge_memory: update folio stat after successful split
  mm/huge_memory: optimize and simplify folio stat update after split
  mm/huge_memory: optimize old_order derivation during folio splitting

 mm/huge_memory.c | 70 +++++++++++++++---------------------------------
 1 file changed, 21 insertions(+), 49 deletions(-)

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2.34.1