[PATCH v2] mm/damon/vaddr: add a comment for 'default' case in damon_va_apply_scheme()

[xiakaixu1987]

From: Kaixu Xia <kaixuxia@xxxxxxxxxxx>

The switch case 'DAMOS_STAT' and switch case 'default' have same
return value in damon_va_apply_scheme(), and the 'default' case
is for DAMOS actions that not supported by 'vaddr'. It might
make sense to add a comment here.

Signed-off-by: Kaixu Xia <kaixuxia@xxxxxxxxxxx>
---
 mm/damon/vaddr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 3c7b9d6dca95..3814200e61e4 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -646,6 +646,9 @@ static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx,
 	case DAMOS_STAT:
 		return 0;
 	default:
+		/*
+		 * DAMOS actions that not yet supported by 'vaddr'.
+		 */
 		return 0;
 	}
 
-- 
2.27.0