From patchwork Sun Feb 9 10:48:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoquan He X-Patchwork-Id: 11372061 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 365F1109A for ; Sun, 9 Feb 2020 10:49:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EE0DF2080C for ; Sun, 9 Feb 2020 10:49:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="JCrrvn5W" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE0DF2080C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 14CC26B0032; Sun, 9 Feb 2020 05:49:07 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 0FC826B0036; Sun, 9 Feb 2020 05:49:07 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 011A36B0037; Sun, 9 Feb 2020 05:49:06 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0136.hostedemail.com [216.40.44.136]) by kanga.kvack.org (Postfix) with ESMTP id DC07F6B0032 for ; Sun, 9 Feb 2020 05:49:06 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 8DEF38248047 for ; Sun, 9 Feb 2020 10:49:06 +0000 (UTC) X-FDA: 76470266292.04.grape42_3264d4b71d159 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,bhe@redhat.com,:linux-kernel@vger.kernel.org::akpm@linux-foundation.org:dan.j.williams@intel.com:richardw.yang@linux.intel.com:david@redhat.com:bhe@redhat.com,RULES_HIT:30029:30054:30056,0,RBL:207.211.31.81:@redhat.com:.lbl8.mailshell.net-62.18.0.100 66.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: grape42_3264d4b71d159 X-Filterd-Recvd-Size: 3802 Received: from us-smtp-delivery-1.mimecast.com (us-smtp-1.mimecast.com [207.211.31.81]) by imf31.hostedemail.com (Postfix) with ESMTP for ; Sun, 9 Feb 2020 10:49:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581245345; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=z6n+AuP+O2svMC+qLOpajdzRjteK4YpkRxZlBgrn3yM=; b=JCrrvn5Wfq47/mk4yJUUIP04ep1hhvftSVkQLxjquJzJC/eyfnM/hcEyHD0IaabKsMnYnR 8+s2cnVPflRJFb45BoIeQNA741BTtU76nt8JDHTNeVhvRhKc8rG5Pwrj2BIRDjQJOaEcVS 4M/Fy2XY7RS9vsQNUcSd8FUrb8/8J/M= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-223-6lR6WDWaM16ElUdnDR3Lyg-1; Sun, 09 Feb 2020 05:49:01 -0500 X-MC-Unique: 6lR6WDWaM16ElUdnDR3Lyg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8E8BE184AEA0; Sun, 9 Feb 2020 10:49:00 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-31.pek2.redhat.com [10.72.12.31]) by smtp.corp.redhat.com (Postfix) with ESMTP id BC73010013A7; Sun, 9 Feb 2020 10:48:56 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, dan.j.williams@intel.com, richardw.yang@linux.intel.com, david@redhat.com, bhe@redhat.com Subject: [PATCH 7/7] mm/hotplug: fix hot remove failure in SPARSEMEM|!VMEMMAP case Date: Sun, 9 Feb 2020 18:48:26 +0800 Message-Id: <20200209104826.3385-8-bhe@redhat.com> In-Reply-To: <20200209104826.3385-1-bhe@redhat.com> References: <20200209104826.3385-1-bhe@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 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: In section_deactivate(), pfn_to_page() doesn't work any more after ms->section_mem_map is resetting to NULL in SPARSEMEM|!VMEMMAP case. It caused hot remove failure, the trace is: kernel BUG at mm/page_alloc.c:4806! invalid opcode: 0000 [#1] SMP PTI CPU: 3 PID: 8 Comm: kworker/u16:0 Tainted: G W 5.5.0-next-20200205+ #340 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 Workqueue: kacpi_hotplug acpi_hotplug_work_fn RIP: 0010:free_pages+0x85/0xa0 Call Trace: __remove_pages+0x99/0xc0 arch_remove_memory+0x23/0x4d try_remove_memory+0xc8/0x130 ? walk_memory_blocks+0x72/0xa0 __remove_memory+0xa/0x11 acpi_memory_device_remove+0x72/0x100 acpi_bus_trim+0x55/0x90 acpi_device_hotplug+0x2eb/0x3d0 acpi_hotplug_work_fn+0x1a/0x30 process_one_work+0x1a7/0x370 worker_thread+0x30/0x380 ? flush_rcu_work+0x30/0x30 kthread+0x112/0x130 ? kthread_create_on_node+0x60/0x60 ret_from_fork+0x35/0x40 Let's defer the ->section_mem_map resetting after depopulate_section_memmap() to fix it. Signed-off-by: Baoquan He --- mm/sparse.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/sparse.c b/mm/sparse.c index 623755e88255..345d065ef6ce 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -854,13 +854,15 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, ms->usage = NULL; } memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); - ms->section_mem_map = (unsigned long)NULL; } if (section_is_early && memmap) free_map_bootmem(memmap); else depopulate_section_memmap(pfn, nr_pages, altmap); + + if(!rc) + ms->section_mem_map = (unsigned long)NULL; } static struct page * __meminit section_activate(int nid, unsigned long pfn,