linux-kernel - [PATCH 3/3] mm/hugetlb: Assert hugetlb_lock in __hugetlb_cgroup_commit

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Message-ID: <20240417211836.2742593-4-peterx@redhat.com>
Date: Wed, 17 Apr 2024 17:18:36 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: peterx@...hat.com,
	David Hildenbrand <david@...hat.com>,
	Mina Almasry <almasrymina@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muchun Song <muchun.song@...ux.dev>,
	David Rientjes <rientjes@...gle.com>
Subject: [PATCH 3/3] 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.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 mm/hugetlb_cgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index aa4486bd3904..e20339a346b9 100644
--- a/mm/hugetlb_cgroup.c
+++ b/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 =
-- 
2.44.0