From patchwork Fri Jul 10 03:16:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin He X-Patchwork-Id: 11655569 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4DC246C1 for ; Fri, 10 Jul 2020 03:16:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 408B120767 for ; Fri, 10 Jul 2020 03:16:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727065AbgGJDQ6 (ORCPT ); Thu, 9 Jul 2020 23:16:58 -0400 Received: from foss.arm.com ([217.140.110.172]:44194 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726495AbgGJDQ6 (ORCPT ); Thu, 9 Jul 2020 23:16:58 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C604D113E; Thu, 9 Jul 2020 20:16:57 -0700 (PDT) Received: from localhost.localdomain (entos-thunderx2-02.shanghai.arm.com [10.169.212.213]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 43D383F9AB; Thu, 9 Jul 2020 20:16:48 -0700 (PDT) From: Jia He To: Catalin Marinas , Will Deacon , Tony Luck , Fenghua Yu , Yoshinori Sato , Rich Felker , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , David Hildenbrand Cc: x86@kernel.org, "H. Peter Anvin" , Dan Williams , Vishal Verma , Dave Jiang , Andrew Morton , Baoquan He , Chuhong Yuan , Mike Rapoport , Logan Gunthorpe , Masahiro Yamada , Michal Hocko , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, linux-nvdimm@lists.01.org, linux-mm@kvack.org, Jonathan Cameron , Kaly Xin , Jia He , stable@vger.kernel.org Subject: [PATCH 2/2] mm/memory_hotplug: fix unpaired mem_hotplug_begin/done Date: Fri, 10 Jul 2020 11:16:19 +0800 Message-Id: <20200710031619.18762-3-justin.he@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200710031619.18762-1-justin.he@arm.com> References: <20200710031619.18762-1-justin.he@arm.com> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org When check_memblock_offlined_cb() returns failed rc(e.g. the memblock is online at that time), mem_hotplug_begin/done is unpaired in such case. Therefore a warning: Call Trace: percpu_up_write+0x33/0x40 try_remove_memory+0x66/0x120 ? _cond_resched+0x19/0x30 remove_memory+0x2b/0x40 dev_dax_kmem_remove+0x36/0x72 [kmem] device_release_driver_internal+0xf0/0x1c0 device_release_driver+0x12/0x20 bus_remove_device+0xe1/0x150 device_del+0x17b/0x3e0 unregister_dev_dax+0x29/0x60 devm_action_release+0x15/0x20 release_nodes+0x19a/0x1e0 devres_release_all+0x3f/0x50 device_release_driver_internal+0x100/0x1c0 driver_detach+0x4c/0x8f bus_remove_driver+0x5c/0xd0 driver_unregister+0x31/0x50 dax_pmem_exit+0x10/0xfe0 [dax_pmem] Fixes: f1037ec0cc8a ("mm/memory_hotplug: fix remove_memory() lockdep splat") Cc: stable@vger.kernel.org # v5.6+ Signed-off-by: Jia He Reviewed-by: David Hildenbrand Acked-by: Michal Hocko Acked-by: Dan Williams --- mm/memory_hotplug.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index b49ab743d914..3e0645387daf 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1752,7 +1752,7 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size) */ rc = walk_memory_blocks(start, size, NULL, check_memblock_offlined_cb); if (rc) - goto done; + return rc; /* remove memmap entry */ firmware_map_remove(start, start + size, "System RAM"); @@ -1776,9 +1776,8 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size) try_offline_node(nid); -done: mem_hotplug_done(); - return rc; + return 0; } /**