[RFC PATCH v2.1 02/17] mm/damon/paddr: support PGIDLE_UNSET probe filter type

[SJ Park <sj@kernel.org>]

Implement support of DAMON_FILTER_TYPE_PGIDLE_UNSET in the physical
address space DAMON operations set.  It reuses damon_folio_young(),
which was being used for access monitoring.

Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/paddr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 5c6c3a597fd0b..5b307dcbb2a50 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -132,6 +132,12 @@ static bool damon_pa_filter_match(struct damon_filter *filter,
 			matched = filter->memcg_id == mem_cgroup_id(memcg);
 		rcu_read_unlock();
 		break;
+	case DAMON_FILTER_TYPE_PGIDLE_UNSET:
+		if (!folio)
+			matched = false;
+		else
+			matched = damon_folio_young(folio);
+		break;
 	default:
 		break;
 	}
-- 
2.47.3