[merged mm-stable] mm-hugetlb_cgroup-move-per-node-usage-on-cgroup-reparenting.patch removed from -mm tree

[merged mm-stable] mm-hugetlb_cgroup-move-per-node-usage-on-cgroup-reparenting.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/hugetlb_cgroup: move per-node usage on cgroup reparenting
has been removed from the -mm tree.  Its filename was
     mm-hugetlb_cgroup-move-per-node-usage-on-cgroup-reparenting.patch

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

------------------------------------------------------
From: Hongfu Li <lihongfu@kylinos.cn>
Subject: mm/hugetlb_cgroup: move per-node usage on cgroup reparenting
Date: Fri, 18 Sep 2026 10:56:11 +0800

hugetlb_cgroup_css_offline() hands the folios of a dying cgroup over to
its parent with hugetlb_cgroup_move_parent(), which moves the page_counter
charges and the hugetlb_cgroup pointer of the folio but not its per-node
usage.  The parent's hugetlb.<size>.numa_stat is short by that usage while
they are charged, and underflows once they are freed, exposing incorrect
per-node usage values to userspace.

Move the per-node usage to the parent as well.  The folios keep their node
here, so only the cgroup which holds the usage changes.

Link: https://lore.kernel.org/20260918-for-hugetlb-charge-v2-2-2b6d8c2bdc36@kylinos.cn
Fixes: f47761999052 ("hugetlb: add hugetlb.*.numa_stat file")
Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Muchun Song <muchun.song@linux.dev>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: <stable@vger.kernel.org>
---

 mm/hugetlb_cgroup.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/hugetlb_cgroup.c~mm-hugetlb_cgroup-move-per-node-usage-on-cgroup-reparenting
+++ a/mm/hugetlb_cgroup.c
@@ -241,6 +241,8 @@ static void hugetlb_cgroup_move_parent(i
 	/* Take the pages off the local counter */
 	page_counter_cancel(counter, nr_pages);
 
+	hugetlb_cgroup_move_usage(h_cg, parent, folio, folio);
+
 	set_hugetlb_cgroup(folio, parent);
 out:
 	return;
_

Patches currently in -mm which might be from lihongfu@kylinos.cn are

mm-hugetlb-account-migration-target-folio-in-per-node-nr_hugetlb-vmstat.patch
mm-memcg-migrate-per-node-hugetlb-lruvec-stat-together-with-hugetlb-folio.patch
mm-memfd-fix-hugetlb-reservation-accounting-in-error-paths.patch