From patchwork Wed May 5 00:30:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Edgecombe, Rick P" X-Patchwork-Id: 12238737 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3832AC433B4 for ; Wed, 5 May 2021 00:33:47 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 721106112D for ; Wed, 5 May 2021 00:33:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 721106112D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-21232-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 13863 invoked by uid 550); 5 May 2021 00:32:51 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 13580 invoked from network); 5 May 2021 00:32:44 -0000 IronPort-SDR: w2yu6YhgIhF4I+nvUdyZszzZ/fjnrR2rYbGzJw7xI0cKVtty39B97NVYoIKd2+cWUIR+LwHFBB SuH0zYMV3psA== X-IronPort-AV: E=McAfee;i="6200,9189,9974"; a="198192797" X-IronPort-AV: E=Sophos;i="5.82,273,1613462400"; d="scan'208";a="198192797" IronPort-SDR: roaeflJUzMbIdPqfYu//snYPz/jcvlf7Iez+eWxjvAEdyulf3N7WL8xhAqP51GegBkjQy8tLea FkILiWT9I2SQ== X-IronPort-AV: E=Sophos;i="5.82,273,1613462400"; d="scan'208";a="429490764" From: Rick Edgecombe To: dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, linux-hardening@vger.kernel.org, kernel-hardening@lists.openwall.com Cc: ira.weiny@intel.com, rppt@kernel.org, dan.j.williams@intel.com, linux-kernel@vger.kernel.org, Rick Edgecombe Subject: [PATCH RFC 2/9] list: Support list head not in object for list_lru Date: Tue, 4 May 2021 17:30:25 -0700 Message-Id: <20210505003032.489164-3-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210505003032.489164-1-rick.p.edgecombe@intel.com> References: <20210505003032.489164-1-rick.p.edgecombe@intel.com> MIME-Version: 1.0 In future patches, there will be a need to keep track of objects with list_lru where the list_head is not in the object (will be in struct page). Since list_lru automatically determines the node id from the list_head, this will fail when using struct page. So create a new function in list_lru, list_lru_add_node(), that allows the node id of the item to be passed in. Otherwise it behaves exactly like list_lru_add(). Signed-off-by: Rick Edgecombe --- include/linux/list_lru.h | 13 +++++++++++++ mm/list_lru.c | 10 ++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h index 4bde44a5024b..7ad149b22223 100644 --- a/include/linux/list_lru.h +++ b/include/linux/list_lru.h @@ -90,6 +90,19 @@ void memcg_drain_all_list_lrus(int src_idx, struct mem_cgroup *dst_memcg); */ bool list_lru_add(struct list_lru *lru, struct list_head *item); +/** + * list_lru_add_node: add an element to the lru list's tail + * @list_lru: the lru pointer + * @item: the item to be added. + * @nid: the node id of the item + * + * Like list_lru_add, but takes the node id as parameter instead of + * calculating it from the list_head passed in. + * + * Return value: true if the list was updated, false otherwise + */ +bool list_lru_add_node(struct list_lru *lru, struct list_head *item, int nid); + /** * list_lru_del: delete an element to the lru list * @list_lru: the lru pointer diff --git a/mm/list_lru.c b/mm/list_lru.c index fd5b19dcfc72..8e32a6fc1527 100644 --- a/mm/list_lru.c +++ b/mm/list_lru.c @@ -112,9 +112,8 @@ list_lru_from_kmem(struct list_lru_node *nlru, void *ptr, } #endif /* CONFIG_MEMCG_KMEM */ -bool list_lru_add(struct list_lru *lru, struct list_head *item) +bool list_lru_add_node(struct list_lru *lru, struct list_head *item, int nid) { - int nid = page_to_nid(virt_to_page(item)); struct list_lru_node *nlru = &lru->node[nid]; struct mem_cgroup *memcg; struct list_lru_one *l; @@ -134,6 +133,13 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item) spin_unlock(&nlru->lock); return false; } + +bool list_lru_add(struct list_lru *lru, struct list_head *item) +{ + int nid = page_to_nid(virt_to_page(item)); + + return list_lru_add_node(lru, item, nid); +} EXPORT_SYMBOL_GPL(list_lru_add); bool list_lru_del(struct list_lru *lru, struct list_head *item)