From patchwork Wed Aug 25 19:17:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 502834 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 37D69C4320A for ; Wed, 25 Aug 2021 19:17:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 18148610E9 for ; Wed, 25 Aug 2021 19:17:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236891AbhHYTSm (ORCPT ); Wed, 25 Aug 2021 15:18:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:57232 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235172AbhHYTSm (ORCPT ); Wed, 25 Aug 2021 15:18:42 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id CF4BE60EAF; Wed, 25 Aug 2021 19:17:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1629919076; bh=9eKVWYxZZwTl0suLazziuyIoja5ndJharWDLiFA0Ob0=; h=Date:From:To:Subject:In-Reply-To:From; b=Zrka7NY7T3o4zSnZpv/rQA/yMEwda7j6ZdxeUV8aHfCnQpHe8XGLTghTc3Q9jY+0E 20Ez6N1By6iAb6+FSr9BFb+QEpd7zihpqwWnLWvPtt6kqqe594+oqwfsMwsJo1QUWo dQSkVFADAKy8v3HVkwRC6bZVs9K7gT5QY9Ss2+VM= Date: Wed, 25 Aug 2021 12:17:55 -0700 From: Andrew Morton To: akpm@linux-foundation.org, cgoldswo@codeaurora.org, david@redhat.com, linmiaohe@huawei.com, linux-mm@kvack.org, mhocko@suse.com, minchan@kernel.org, mm-commits@vger.kernel.org, naoya.horiguchi@nec.com, osalvador@suse.de, stable@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 1/2] mm/memory_hotplug: fix potential permanent lru cache disable Message-ID: <20210825191755.q1BM2fgnb%akpm@linux-foundation.org> In-Reply-To: <20210825121725.0b4f7ca217e22d9750bc6a6d@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Miaohe Lin Subject: mm/memory_hotplug: fix potential permanent lru cache disable 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. Link: https://lkml.kernel.org/r/20210821094246.10149-3-linmiaohe@huawei.com Fixes: d479960e44f2 ("mm: disable LRU pagevec during the migration temporarily") Signed-off-by: Miaohe Lin Reviewed-by: David Hildenbrand Reviewed-by: Oscar Salvador Reviewed-by: Naoya Horiguchi Cc: Chris Goldsworthy Cc: Michal Hocko Cc: Minchan Kim Cc: Signed-off-by: Andrew Morton --- mm/memory_hotplug.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/memory_hotplug.c~mm-memory_hotplug-fix-potential-permanent-lru-cache-disable +++ a/mm/memory_hotplug.c @@ -1731,6 +1731,7 @@ failed_removal_isolated: 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",