[merged mm-hotfixes-stable] mm-mempolicy-fix-incorrect-freeing-of-wi_kobj.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-mempolicy-fix-incorrect-freeing-of-wi_kobj.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mempolicy: fix incorrect freeing of wi_kobj
has been removed from the -mm tree.  Its filename was
     mm-mempolicy-fix-incorrect-freeing-of-wi_kobj.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Joshua Hahn <joshua.hahnjy@gmail.com>
Subject: mm/mempolicy: fix incorrect freeing of wi_kobj
Date: Mon, 2 Jun 2025 09:23:39 -0700

We should not free wi_group->wi_kobj here.  In the error path of
add_weighted_interleave_group() where this snippet is called from,
kobj_{del, put} is immediately called right after this section.  Thus, it
is not only unnecessary but also incorrect to free it here.

Link: https://lkml.kernel.org/r/20250602162345.2595696-1-joshua.hahnjy@gmail.com
Fixes: e341f9c3c841 ("mm/mempolicy: Weighted Interleave Auto-tuning")
Signed-off-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506011545.Fduxqxqj-lkp@intel.com/
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Mathew Brost <matthew.brost@intel.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mempolicy.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/mm/mempolicy.c~mm-mempolicy-fix-incorrect-freeing-of-wi_kobj
+++ a/mm/mempolicy.c
@@ -3708,15 +3708,13 @@ static void wi_state_free(void)
 			lockdep_is_held(&wi_state_lock));
 	if (!old_wi_state) {
 		mutex_unlock(&wi_state_lock);
-		goto out;
+		return;
 	}
 
 	rcu_assign_pointer(wi_state, NULL);
 	mutex_unlock(&wi_state_lock);
 	synchronize_rcu();
 	kfree(old_wi_state);
-out:
-	kfree(&wi_group->wi_kobj);
 }
 
 static struct kobj_attribute wi_auto_attr =
_

Patches currently in -mm which might be from joshua.hahnjy@gmail.com are

mm-mempolicy-skip-unnecessary-synchronize_rcu.patch