selftests/damon: stop kdamond on error exits of no-op commit test

Patch series "mm/damon: misc improvements in tests and documents".

Add various improvements to DAMON tests and documents.

Patch 1 and 2 from Zenghui Yu (Huawei) let DAMON selftest to clean up its
state and output after running the tests.  Patch 3 from Eva Kurchatova
makes a few selftest be able to run with Python's safe path mode.  Patch 4
from Kunwu Chan improves coverage of DAMON kunit tests.  Finally, patches
5 and 6 from Liew Rui Yan clarify and fix typos on documents for DAMOS
quota behaviors.

Below are notes that can be removed in the final commit message.

This is a batched repost of DAMON patches that were individually posted. 
Please refer to each patch for changelog.


This patch (of 6):

The sysfs_no_op_commit_break test starts a kdamond via sysfs, but its
error paths (e.g., drgn not installed) exit without stopping it.  The
leaked kdamond then makes subsequent tests, e.g.  lru_sort.sh and
reclaim.sh, skip with "Another kdamond is running".

Wrap the post-start logic in try-finally so that kdamonds.stop() is
executed on every exit path.

Link: https://lore.kernel.org/20260914141952.91465-1-sj@kernel.org
Link: https://lore.kernel.org/20260914141952.91465-2-sj@kernel.org
Fixes: 10725cd2b09a ("selftests/damon: test no-op commit broke DAMON status")
Signed-off-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Reviewed-by: SJ Park <sj@kernel.org>
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Assisted-by: GLM-5.3 OpenCode
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@davidgow.net>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Cc: Kunwu Chan <kunwu.chan@gmail.com>
Cc: Lian Wang <lianux.mm@gmail.com>
Cc: Liew Rui Yan <aethernet65535@gmail.com>

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