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

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.

[akpm@linux-foundation.org: fx comment grammar]
Link: https://lkml.kernel.org/r/1662606797-23534-1-git-send-email-kaixuxia@tencent.com
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 349b44d..c2c08c1 100644 (file)
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -658,6 +658,9 @@ static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx,
        case DAMOS_STAT:
                return 0;
        default:
+               /*
+                * DAMOS actions that are not yet supported by 'vaddr'.
+                */
                return 0;
        }