Fix a few Sashiko-found unurgent bugs.  Patch 1 fixes use of
uninitialized damos->last_applied field.  Patches 2-7 fix DAMON kunit
tests that do invalid memory access under test failures.

The bugs are better to be fixed and eventually merged into stable@
kernel.  That said, the fixes are arguably not urgent.  Patch 1 only
introduces negligible DAMOS efficiency degradation in occasional
cases.  Kunit fixes could introduce quite bad consequences but those
are test code that affect only test run setups.

SJ Park (7):
  mm/damon/core: initialize damos->last_applied
  mm/damon/core-kunit: check region count before testing in split_at()
  mm/damon/vaddr-kunit: check region count in three_regions test
  mm/damon/core-kunit: handle region split failure in filter_out()
  mm/damon/core-kunit: skip wrong dest walk in commit_dests_for()
  mm/damon/core-kunit: skip wrong quota goal walk in
    commit_quota_goals()
  mm/damon/core-kunit: skip wrong region walk in commit_target_regions()

 mm/damon/core.c              |  1 +
 mm/damon/tests/core-kunit.h  | 28 ++++++++++++++++++++++++++--
 mm/damon/tests/vaddr-kunit.h |  5 +++++
 3 files changed, 32 insertions(+), 2 deletions(-)


base-commit: 1ce4cbd62f48552188b3f6fac8a14b709e97b7be
-- 
2.47.3

On Thu, 16 Jul 2026 17:30:14 -0700 SJ Park <sj@kernel.org> wrote:

> Fix a few Sashiko-found unurgent bugs.  Patch 1 fixes use of
> uninitialized damos->last_applied field.  Patches 2-7 fix DAMON kunit
> tests that do invalid memory access under test failures.

This was meant to be RFC, but I forgot adding the tag.  Andrew, please don't
merge this as is.  Sorry for confusing people.


Thanks,
SJ

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