The damon_sample_mtier_start() can fail so we must reset the "enable"
parameter to "false" again for proper rollback.
In such cases, setting Y to "enable" then N triggers the similar crash
with mtier because damon sample start failed but the "enable" stays as Y.
Link: https://lkml.kernel.org/r/20250702000205.1921-4-honggyu.kim@sk.com
Fixes: 82a08bde3c ("samples/damon: implement a DAMON module for memory tiering")
Signed-off-by: Honggyu Kim <honggyu.kim@sk.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Implement a sample DAMON module that shows how self-tuned DAMON-based
memory tiering can be written. It is a sample since the purpose is to
give an idea about how it can be implemented and perform, rather than be
used on general production setups. Especially, it supports only two tiers
memory setup having only one CPU-attached NUMA node.
[sj@kernel.org: fix wrong DAMON attrs setting]
Link: https://lkml.kernel.org/r/20250510220932.47722-1-sj@kernel.org
[sj@kernel.org: trigger build even if only mtier is enabled]
Link: https://lkml.kernel.org/r/20250426184054.11437-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20250420194030.75838-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Yunjeong Mun <yunjeong.mun@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
