[PATCH] mm/damon/sysfs-schemes: fix double increment of nr_regions

[Vineet Agarwal]

damos_sysfs_populate_region_dir() increments
sysfs_regions->nr_regions twice when adding a new region:
once explicitly before kobject_init_and_add(), and once
again through the post-increment used for the kobject name.

As a result, nr_regions no longer matches the actual
number of live regions, and region directory names skip
numbers (1, 3, 5, ...).

Use the already incremented value for naming instead of
incrementing nr_regions a second time.

Fixes: 66178e4ec30a ("mm/damon/sysfs: use damos_walk() for update_schemes_tried_{bytes,regions}")
Signed-off-by: Vineet Agarwal <agarwal.vineet2006@xxxxxxxxx>
---
 mm/damon/sysfs-schemes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 622c3799db87..5d966ac86419 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -2998,7 +2998,7 @@ void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,
 	if (kobject_init_and_add(&region->kobj,
 				&damon_sysfs_scheme_region_ktype,
 				&sysfs_regions->kobj, "%d",
-				sysfs_regions->nr_regions++)) {
+				sysfs_regions->nr_regions)) {
 		kobject_put(&region->kobj);
 	}
 }
-- 
2.54.0