mm/hugetlb: assert hugetlb_lock in __hugetlb_cgroup_commit_charge

This is similar to __hugetlb_cgroup_uncharge_folio() where it relies on
holding hugetlb_lock.  Add the similar assertion like the other one, since
it looks like such things may help some day.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Peter Xu <[email protected]>
Reviewed-by: Mina Almasry <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Muchun Song <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: xzpeter

mm/hugetlb_cgroup.c

@@ -308,7 +308,7 @@ static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 {
 	if (hugetlb_cgroup_disabled() || !h_cg)
 		return;
-
+	lockdep_assert_held(&hugetlb_lock);
 	__set_hugetlb_cgroup(folio, h_cg, rsvd);
 	if (!rsvd) {
 		unsigned long usage =