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,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 0282AC4320A for ; Sat, 21 Aug 2021 09:43:03 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9321B61040 for ; Sat, 21 Aug 2021 09:43:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9321B61040 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id A5E146B0072; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 802268D0005; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4CCB76B0072; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0243.hostedemail.com [216.40.44.243]) by kanga.kvack.org (Postfix) with ESMTP id 26DCD8D0001 for ; Sat, 21 Aug 2021 05:42:58 -0400 (EDT) Received: from smtpin32.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id C3FA12BC11 for ; Sat, 21 Aug 2021 09:42:57 +0000 (UTC) X-FDA: 78498598794.32.F842661 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by imf22.hostedemail.com (Postfix) with ESMTP id 326A91903 for ; Sat, 21 Aug 2021 09:42:57 +0000 (UTC) Received: from dggeme703-chm.china.huawei.com (unknown [172.30.72.56]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4GsD7l5vY0z87pK; Sat, 21 Aug 2021 17:42:43 +0800 (CST) Received: from huawei.com (10.175.124.27) by dggeme703-chm.china.huawei.com (10.1.199.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Sat, 21 Aug 2021 17:42:54 +0800 From: Miaohe Lin To: CC: , , , , , , Subject: [PATCH 2/3] mm/memory_hotplug: fix potential permanent lru cache disable Date: Sat, 21 Aug 2021 17:42:45 +0800 Message-ID: <20210821094246.10149-3-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210821094246.10149-1-linmiaohe@huawei.com> References: <20210821094246.10149-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggeme703-chm.china.huawei.com (10.1.199.99) X-CFilter-Loop: Reflected Authentication-Results: imf22.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=huawei.com; spf=pass (imf22.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.189 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 326A91903 X-Stat-Signature: k8c4teepdms6shc1fpn5a54eabmn1z3j X-HE-Tag: 1629538977-205136 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: If offline_pages failed after lru_cache_disable(), it forgot to do lru_cache_enable() in error path. So we would have lru cache disabled permanently in this case. Fixes: d479960e44f2 ("mm: disable LRU pagevec during the migration tempor= arily") Signed-off-by: Miaohe Lin --- mm/memory_hotplug.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index d986d3791986..9fd0be32a281 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -2033,6 +2033,7 @@ int __ref offline_pages(unsigned long start_pfn, un= signed long nr_pages, undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); memory_notify(MEM_CANCEL_OFFLINE, &arg); failed_removal_pcplists_disabled: + lru_cache_enable(); zone_pcp_enable(zone); failed_removal: pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", --=20 2.23.0