DAMON_SYSFS can leak memory due to improper handling of damon_call()
failure.  It can also cause a deadlock due to a race between
damon_call() and kdamond_fn() termination.  Fix those.

SeongJae Park (2):
  mm/damon/sysfs: dealloc repeat_call_control if damon_call() fails
  mm/damon/core: fix damon_call() vs kdamond_fn() exit race deadlock

 include/linux/damon.h |  1 +
 mm/damon/core.c       | 41 ++++++++++-------------------------------
 mm/damon/sysfs.c      |  3 ++-
 3 files changed, 13 insertions(+), 32 deletions(-)


base-commit: 2b3fbc1796d335685d9b7a825c621914a1c97d1d
-- 
2.47.3

Forwarding sashiko.dev review status for this thread.

# review url: https://sashiko.dev/#/patchset/20260326062347.88569-1-sj@kernel.org

- [RFC PATCH 1/2] mm/damon/sysfs: dealloc repeat_call_control if damon_call() fails
  - status: Reviewed
  - review: No issues found.
- [RFC PATCH 2/2] mm/damon/core: fix damon_call() vs kdamond_fn() exit race deadlock
  - status: Reviewed
  - review: ISSUES MAY FOUND

# hkml [1] generated a draft of this mail.  It can be regenerated
# using below command:
#
#     hkml patch sashiko_dev --thread_status --for_forwarding \
#             20260326062347.88569-1-sj@kernel.org
#
# [1] https://github.com/sjp38/hackermail

Sent using hkml (https://github.com/sjp38/hackermail)

On Thu, 26 Mar 2026 06:42:08 -0700 SeongJae Park <sj@kernel.org> wrote:

> Forwarding sashiko.dev review status for this thread.
> 
> # review url: https://sashiko.dev/#/patchset/20260326062347.88569-1-sj@kernel.org
> 
> - [RFC PATCH 1/2] mm/damon/sysfs: dealloc repeat_call_control if damon_call() fails
>   - status: Reviewed
>   - review: No issues found.
> - [RFC PATCH 2/2] mm/damon/core: fix damon_call() vs kdamond_fn() exit race deadlock
>   - status: Reviewed
>   - review: ISSUES MAY FOUND

The patches are hotfixes, and have no reason to be one series.

I will send the first patch as an individual one without RFC, soon.

For the second patch, I will go one more RFC round.


Thanks,
SJ

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