Support DAMON sysfs interface based setup of DAMON_FILTER_TYPE_ACTIVE
type DAMON filters.  For that, wire the type with a new user keyword,
"active".  Users can set up the new type of filter using the existing
DAMON filter setup interface with the new keyword.

Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/sysfs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 70a4b64fb8ea9..779c98205a94b 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1011,6 +1011,10 @@ damon_sysfs_filter_type_names[] = {
 		.type = DAMON_FILTER_TYPE_HUGEPAGE_SIZE,
 		.name = "hugepage_size",
 	},
+	{
+		.type = DAMON_FILTER_TYPE_ACTIVE,
+		.name = "active",
+	},
 };
 
 static ssize_t type_show(struct kobject *kobj,
-- 
2.47.3