+ mm-damon-sysfs-kobject_del-region-and-target-error-dirs.patch added to mm-new branch

+ mm-damon-sysfs-kobject_del-region-and-target-error-dirs.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/sysfs: kobject_del() region and target (error) dirs
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-sysfs-kobject_del-region-and-target-error-dirs.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-kobject_del-region-and-target-error-dirs.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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and is updated there most days

------------------------------------------------------
From: SJ Park <sj@kernel.org>
Subject: mm/damon/sysfs: kobject_del() region and target (error) dirs
Date: Sun, 28 Jun 2026 15:01:11 -0700

On CONFIG_DEBUG_KOBJECT_RELEASE enabled kernel, lack of kobject_del()
could cause directories creation failures due to the name conflicts.  Fix
those issues for the normal creation path of region directories and the
error path of target directories, by adding kobject_del() calls.

Link: https://lore.kernel.org/20260628220121.97360-3-sj@kernel.org
Fixes: 2031b14ea757 ("mm/damon/sysfs: support the physical address space monitoring")
Signed-off-by: SJ Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> # 5.18.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/mm/damon/sysfs.c~mm-damon-sysfs-kobject_del-region-and-target-error-dirs
+++ a/mm/damon/sysfs.c
@@ -105,8 +105,10 @@ static void damon_sysfs_regions_rm_dirs(
 	struct damon_sysfs_region **regions_arr = regions->regions_arr;
 	int i;
 
-	for (i = 0; i < regions->nr; i++)
+	for (i = 0; i < regions->nr; i++) {
+		kobject_del(&regions_arr[i]->kobj);
 		kobject_put(&regions_arr[i]->kobj);
+	}
 	regions->nr = 0;
 	kfree(regions_arr);
 	regions->regions_arr = NULL;
@@ -370,13 +372,15 @@ static int damon_sysfs_targets_add_dirs(
 
 		err = damon_sysfs_target_add_dirs(target);
 		if (err)
-			goto out;
+			goto del_out;
 
 		targets_arr[i] = target;
 		targets->nr++;
 	}
 	return 0;
 
+del_out:
+	kobject_del(&target->kobj);
 out:
 	damon_sysfs_targets_rm_dirs(targets);
 	kobject_put(&target->kobj);
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-sysfs-schemes-fix-dir-put-orders-in-access_pattern_add_dirs.patch
mm-damon-sysfs-schemes-put-stats-for-scheme_add_dirs-internal-error.patch
mm-damon-ops-common-handle-extreme-intervals-in-damon_hot_score.patch
maintainers-s-seongjae-sj.patch
samples-damon-wsse-handle-damon_start-failure.patch
samples-damon-prcl-handle-damon_start-failure.patch
samples-damon-mtier-handle-damon_start-failure.patch
samples-damon-mtier-handle-damon_stop-failure.patch
samples-damon-wsse-stop-and-free-damon-ctx-when-damon_call-fails.patch
samples-damon-prcl-stop-and-free-damon-ctx-when-damon_call-fails.patch
mm-damon-sysfs-kobject_del-target-normal-context-and-kdamond-dirs.patch
mm-damon-sysfs-kobject_del-region-and-target-error-dirs.patch
mm-damon-sysfs-schemes-kobject_del-scheme-dirs.patch
mm-damon-sysfs-schemes-kobject_del-scheme-region-dirs.patch
mm-damon-sysfs-schemes-kobject_del-scheme-filter-dirs.patch
mm-damon-sysfs-schemes-kobject_del-scheme-quota-goal-dirs.patch
mm-damon-sysfs-schemes-kobject_del-scheme-action-destination-dirs.patch
mm-damon-sysfs-kobject_del-probe-dirs.patch
mm-damon-sysfs-kobject_del-probe-filter-dirs.patch
mm-damon-sysfs-kobject_del-probe-dirs-in-probes_addd_dir-error-path.patch
mm-damon-sysfs-schemes-kobject_del-region-for-populate_region-error.patch