FAILED: patch "[PATCH] mm/damon/sysfs-scheme: cleanup access_pattern subdirs on" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 392b3d9d595f34877dd745b470c711e8ebcd225c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026012015-plank-morphing-040c@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 392b3d9d595f34877dd745b470c711e8ebcd225c Mon Sep 17 00:00:00 2001
From: SeongJae Park <[email protected]>
Date: Wed, 24 Dec 2025 18:30:37 -0800
Subject: [PATCH] mm/damon/sysfs-scheme: cleanup access_pattern subdirs on
scheme dir setup failure

When a DAMOS-scheme DAMON sysfs directory setup fails after setup of access_pattern/ directory, subdirectories of access_pattern/ directory are not cleaned up. As a result, DAMON sysfs interface is nearly broken until the system reboots, and the memory for the unremoved directory is leaked.

Cleanup the directories under such failures.

index 2c7a2b54be57..3a699dcd5a7f 100644
@@ -2152,7 +2152,7 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 		return err;
 	err = damos_sysfs_set_dests(scheme);
 	if (err)
-		goto put_access_pattern_out;
+		goto rmdir_put_access_pattern_out;
 	err = damon_sysfs_scheme_set_quotas(scheme);
 	if (err)
 		goto put_dests_out;

@@ -2190,7 +2190,8 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 put_dests_out:
 	kobject_put(&scheme->dests->kobj);
 	scheme->dests = NULL;
-put_access_pattern_out:
+rmdir_put_access_pattern_out:
+	damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern);
 	kobject_put(&scheme->access_pattern->kobj);
 	scheme->access_pattern = NULL;
 	return err;

When a DAMOS-scheme DAMON sysfs directory setup fails after setup of access_pattern/ directory, subdirectories of access_pattern/ directory are not cleaned up. As a result, DAMON sysfs interface is nearly broken until the system reboots, and the memory for the unremoved directory is leaked.

Cleanup the directories under such failures.

---
 mm/damon/sysfs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

index 18f459a3c9fff..1b85a0beeaaa4 100644
@@ -856,7 +856,7 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 		return err;
 	err = damon_sysfs_scheme_set_quotas(scheme);
 	if (err)
-		goto put_access_pattern_out;
+		goto rmdir_put_access_pattern_out;
 	err = damon_sysfs_scheme_set_watermarks(scheme);
 	if (err)
 		goto put_quotas_access_pattern_out;

@@ -871,7 +871,8 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 put_quotas_access_pattern_out:
 	kobject_put(&scheme->quotas->kobj);
 	scheme->quotas = NULL;
-put_access_pattern_out:
+rmdir_put_access_pattern_out:
+	damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern);
 	kobject_put(&scheme->access_pattern->kobj);
 	scheme->access_pattern = NULL;
 	return err;

2.47.3