[PATCH 0/2] mm/damon: avoid division by zero from damos_quota_score()

SJ Park <[email protected]> Mon, 3 Aug 2026 06:40:31 -0700

Newsgroups	dev.linux.lists.damon,org.kernel.vger.linux-kernel,org.kernel.vger.stable,org.kvack.linux-mm
Message-ID	<[email protected]>

DAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division
by zero in damos_quota_score().  Avoid it by adding parameters
validation checks.

Changes from RFC v2
- RFC v2: https://lore.kernel.org/[email protected]
- Drop RFC tag.
Changes from RFC
- RFC: https://lore.kernel.org/[email protected]
- Add a fix for DAMON_LRU_SORT.

SJ Park (2):
  samples/damon/mtier: error out for zero quota goal target values
  mm/damon/lru_sort: error out for >10000 active_mem_bp

 mm/damon/lru_sort.c   | 2 ++
 samples/damon/mtier.c | 3 +++
 2 files changed, 5 insertions(+)


base-commit: 3bf69d5b51b688b8f923a13b7f12eb9b1c6a284f
-- 
2.47.3