[PATCH v2 0/3] mm/hugetlb: Fix CMA parsing, flags and usage accounting

[Kaitao Cheng <kaitao.cheng@linux.dev>]

This series fixes three independent HugeTLB issues reported by Sashiko,
covering CMA parameter parsing, persistent folio flags, and NR_HUGETLB
accounting on allocation rollback.

Patch 1 rejects a global hugetlb_cma size following node-specific entries.
This prevents malformed input from overwriting valid per-node reservations
with an incorrectly parsed global size.

Patch 2 preserves persistent folio flags when a failed vmemmap restore
returns a folio to the pool. This retains CMA allocation tracking and
raw hardware poison information, while ensuring transient flags are
cleared before returning the folio.

Patch 3 moves NR_HUGETLB node accounting to the underlying folio state
transitions and separates it from memcg statistics. This keeps the
counter balanced when surplus folios are freed during reservation
gathering or after a failed overcommit recheck.


Changes in v2:
- Patch 2: Preserve persistent flags, clear transient flags, and warn
  about unexpected flags.
- Patch 3: Account at folio state transitions and separate node and
  memcg statistics.

Link to v1:
https://lore.kernel.org/all/20261028113319.38544-1-kaitao.cheng@linux.dev/

Kaitao Cheng (3):
  mm/hugetlb_cma: fix incorrect hugetlb_cma_size assignment on malformed
    input
  mm/hugetlb: Preserve persistent flags when returning folios to the
    pool
  mm/hugetlb: Fix NR_HUGETLB accounting for surplus folios

 mm/hugetlb.c     | 52 +++++++++++++++++++++++++++++++-----------------
 mm/hugetlb_cma.c |  3 +++
 mm/memcontrol.c  |  6 +-----
 3 files changed, 38 insertions(+), 23 deletions(-)

-- 
2.54.0 (Apple Git-157)