+ mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.patch added to mm-new branch

+ mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.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-cleanup-attrs-subdirs-on-context-dir-setup-failure.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

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure
Date: Wed, 24 Dec 2025 18:30:35 -0800

When a context DAMON sysfs directory setup is failed after setup of attrs/
directory, subdirectories of attrs/ 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.

Link: https://lkml.kernel.org/r/20251225023043.18579-3-sj@kernel.org
Fixes: c951cd3b8901 ("mm/damon: implement a minimal stub for sysfs-based DAMON interface")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: chongjiapeng <jiapeng.chong@linux.alibaba.com>
Cc: <stable@vger.kernel.org> # 5.18.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

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

--- a/mm/damon/sysfs.c~mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure
+++ a/mm/damon/sysfs.c
@@ -950,7 +950,7 @@ static int damon_sysfs_context_add_dirs(
 
 	err = damon_sysfs_context_set_targets(context);
 	if (err)
-		goto put_attrs_out;
+		goto rmdir_put_attrs_out;
 
 	err = damon_sysfs_context_set_schemes(context);
 	if (err)
@@ -960,7 +960,8 @@ static int damon_sysfs_context_add_dirs(
 put_targets_attrs_out:
 	kobject_put(&context->targets->kobj);
 	context->targets = NULL;
-put_attrs_out:
+rmdir_put_attrs_out:
+	damon_sysfs_attrs_rm_dirs(context->attrs);
 	kobject_put(&context->attrs->kobj);
 	context->attrs = NULL;
 	return err;
_

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

mm-damon-core-remove-call_control-in-inactive-contexts.patch
mm-damon-core-introduce-nr_snapshots-damos-stat.patch
mm-damon-sysfs-schemes-introduce-nr_snapshots-damos-stat-file.patch
docs-mm-damon-design-update-for-nr_snapshots-damos-stat.patch
docs-admin-guide-mm-damon-usage-update-for-nr_snapshots-damos-stat.patch
docs-abi-damon-update-for-nr_snapshots-damos-stat.patch
mm-damon-update-damos-kerneldoc-for-stat-field.patch
mm-damon-core-implement-max_nr_snapshots.patch
mm-damon-sysfs-schemes-implement-max_nr_snapshots-file.patch
docs-mm-damon-design-update-for-max_nr_snapshots.patch
docs-admin-guide-mm-damon-usage-update-for-max_nr_snapshots.patch
docs-abi-damon-update-for-max_nr_snapshots.patch
mm-damon-core-add-trace-point-for-damos-stat-per-apply-interval.patch
mm-damon-sysfs-cleanup-intervals-subdirs-on-attrs-dir-setup-failure.patch
mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.patch
mm-damon-sysfs-scheme-cleanup-quotas-subdirs-on-scheme-dir-setup-failure.patch
mm-damon-sysfs-scheme-cleanup-access_pattern-subdirs-on-scheme-dir-setup-failure.patch