[Patch v2 0/3] unify PMD scan results and remove redundant cleanup

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

This small series addresses two minor cleanup opportunities in the hugepage
collapse logic.

The initial motivation arose during a code review of madvise_collapse(),
where it was noted that the function was missing a handler for
SCAN_PMD_NONE. This oversight exposed the inconsistent handling of
SCAN_PMD_NULL and SCAN_PMD_NONE.

Since both scan results are functionally identical (they indicate the
absence of a PTE table), the primary patch unifies them into a single,
clearer identifier, SCAN_NO_PTE_TABLE.

The series also takes the opportunity to remove a redundant clearing of
the struct collapse_control.

---
v1: http://lkml.kernel.org/r/20251112020031.25350-1-richard.weiyang@gmail.com

Wei Yang (3):
  mm/khugepaged: remove redundant clearing of struct collapse_control
  mm/khugepaged: continue to collapse on SCAN_PMD_NONE
  mm/khugepaged: unify SCAN_PMD_NONE and SCAN_PMD_NULL into
    SCAN_NO_PTE_TABLE

 include/trace/events/huge_memory.h |  3 +--
 mm/khugepaged.c                    | 24 ++++++++++--------------
 2 files changed, 11 insertions(+), 16 deletions(-)

-- 
2.34.1