From mboxrd@z Thu Jan 1 00:00:00 1970 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=ham 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 20B73C4320E for ; Tue, 31 Aug 2021 00:00:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A76E61008 for ; Tue, 31 Aug 2021 00:00:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233513AbhHaAAy (ORCPT ); Mon, 30 Aug 2021 20:00:54 -0400 Received: from mga09.intel.com ([134.134.136.24]:50152 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239062AbhHaAAx (ORCPT ); Mon, 30 Aug 2021 20:00:53 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10092"; a="218381513" X-IronPort-AV: E=Sophos;i="5.84,364,1620716400"; d="scan'208";a="218381513" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2021 16:59:58 -0700 X-IronPort-AV: E=Sophos;i="5.84,364,1620716400"; d="scan'208";a="530712805" Received: from ajinkyak-mobl2.amr.corp.intel.com (HELO rpedgeco-desk.amr.corp.intel.com) ([10.212.240.95]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2021 16:59:57 -0700 From: Rick Edgecombe To: dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org, x86@kernel.org, akpm@linux-foundation.org, keescook@chromium.org, shakeelb@google.com, vbabka@suse.cz, rppt@kernel.org Cc: Rick Edgecombe , linux-mm@kvack.org, linux-hardening@vger.kernel.org, kernel-hardening@lists.openwall.com, ira.weiny@intel.com, dan.j.williams@intel.com, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 02/19] list: Support list head not in object for list_lru Date: Mon, 30 Aug 2021 16:59:10 -0700 Message-Id: <20210830235927.6443-3-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210830235927.6443-1-rick.p.edgecombe@intel.com> References: <20210830235927.6443-1-rick.p.edgecombe@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org 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 08e07c19fd13..42c22322058b 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 c1bec58168e1..f35f11ada8a1 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) -- 2.17.1