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Thu, 25 Mar 2021 00:29:08 +0000 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Roman Gushchin , Michal Hocko , Shakeel Butt , Oscar Salvador , David Hildenbrand , Muchun Song , David Rientjes , Miaohe Lin , Peter Zijlstra , Matthew Wilcox , HORIGUCHI NAOYA , "Aneesh Kumar K . V" , Waiman Long , Peter Xu , Mina Almasry , Hillf Danton , Andrew Morton , Mike Kravetz Subject: [PATCH 8/8] hugetlb: add lockdep_assert_held() calls for hugetlb_lock Date: Wed, 24 Mar 2021 17:28:35 -0700 Message-Id: <20210325002835.216118-9-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210325002835.216118-1-mike.kravetz@oracle.com> References: <20210325002835.216118-1-mike.kravetz@oracle.com> Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: MWHPR15CA0042.namprd15.prod.outlook.com (2603:10b6:300:ad::28) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from monkey.oracle.com (50.38.35.18) by MWHPR15CA0042.namprd15.prod.outlook.com (2603:10b6:300:ad::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.24 via Frontend Transport; Thu, 25 Mar 2021 00:29:07 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d4f3e426-7179-4b85-4eb3-08d8ef2500fc X-MS-TrafficTypeDiagnostic: BY5PR10MB3875: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2887; 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identity=mailfrom; envelope-from=""; helo=aserp2120.oracle.com; client-ip=141.146.126.78 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616632160-815336 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: After making hugetlb lock irq safe and separating some functionality done under the lock, add some lockdep_assert_held to help verify locking. Signed-off-by: Mike Kravetz --- mm/hugetlb.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index e4c441b878f2..de5b3cf4a155 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1062,6 +1062,8 @@ static bool vma_has_reserves(struct vm_area_struct = *vma, long chg) static void enqueue_huge_page(struct hstate *h, struct page *page) { int nid =3D page_to_nid(page); + + lockdep_assert_held(&hugetlb_lock); list_move(&page->lru, &h->hugepage_freelists[nid]); h->free_huge_pages++; h->free_huge_pages_node[nid]++; @@ -1073,6 +1075,7 @@ static struct page *dequeue_huge_page_node_exact(st= ruct hstate *h, int nid) struct page *page; bool pin =3D !!(current->flags & PF_MEMALLOC_PIN); =20 + lockdep_assert_held(&hugetlb_lock); list_for_each_entry(page, &h->hugepage_freelists[nid], lru) { if (pin && !is_pinnable_page(page)) continue; @@ -1345,6 +1348,7 @@ static void remove_hugetlb_page(struct hstate *h, s= truct page *page, { int nid =3D page_to_nid(page); =20 + lockdep_assert_held(&hugetlb_lock); if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported()) return; =20 @@ -1690,6 +1694,7 @@ static struct page *remove_pool_huge_page(struct hs= tate *h, int nr_nodes, node; struct page *page =3D NULL; =20 + lockdep_assert_held(&hugetlb_lock); for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) { /* * If we're returning unused surplus pages, only examine @@ -1939,6 +1944,7 @@ static int gather_surplus_pages(struct hstate *h, l= ong delta) long needed, allocated; bool alloc_ok =3D true; =20 + lockdep_assert_held(&hugetlb_lock); needed =3D (h->resv_huge_pages + delta) - h->free_huge_pages; if (needed <=3D 0) { h->resv_huge_pages +=3D delta; @@ -2032,6 +2038,7 @@ static void return_unused_surplus_pages(struct hsta= te *h, struct page *page, *t_page; struct list_head page_list; =20 + lockdep_assert_held(&hugetlb_lock); /* Uncommit the reservation */ h->resv_huge_pages -=3D unused_resv_pages; =20 @@ -2527,6 +2534,7 @@ static void try_to_free_low(struct hstate *h, unsig= ned long count, struct list_head page_list; struct page *page, *next; =20 + lockdep_assert_held(&hugetlb_lock); if (hstate_is_gigantic(h)) return; =20 @@ -2573,6 +2581,7 @@ static int adjust_pool_surplus(struct hstate *h, no= demask_t *nodes_allowed, { int nr_nodes, node; =20 + lockdep_assert_held(&hugetlb_lock); VM_BUG_ON(delta !=3D -1 && delta !=3D 1); =20 if (delta < 0) { --=20 2.30.2