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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 3671EC35254 for ; Sun, 9 Feb 2020 10:49:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0801B20733 for ; Sun, 9 Feb 2020 10:49:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="O2AiYMfq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727799AbgBIKtD (ORCPT ); Sun, 9 Feb 2020 05:49:03 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:42914 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727788AbgBIKtB (ORCPT ); Sun, 9 Feb 2020 05:49:01 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581245340; 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=UrkcXvm7NMV0Re5AiF6mLhLz+8rfznTN3+Xg74sBVcE=; b=O2AiYMfqiuBCTd8Pv/bsP5esC5J6qTg4Dh86KfNWNlY1wNvQc/KPgNInXJf9A1oxliEWJv tehfWmwcMII63We9LPOmbULV7aLHdpZqwI3bGZodPmvY2/wZwdFJHXMFRNh8vqCuqi0RR/ bIwaNESnAdmIix6clOMeLhA1rIuWGio= 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-238-DwMZTUXjOn61rZpMJ1k2qQ-1; Sun, 09 Feb 2020 05:48:57 -0500 X-MC-Unique: DwMZTUXjOn61rZpMJ1k2qQ-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 27B441005510; Sun, 9 Feb 2020 10:48:56 +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 C41ED10013A7; Sun, 9 Feb 2020 10:48:49 +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 6/7] mm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM Date: Sun, 9 Feb 2020 18:48:25 +0800 Message-Id: <20200209104826.3385-7-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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wei Yang When we use SPARSEMEM instead of SPARSEMEM_VMEMMAP, pfn_to_page() doesn't work before sparse_init_one_section() is called. This leads to a crash when hotplug memory. PGD 0 P4D 0 Oops: 0002 [#1] SMP PTI CPU: 3 PID: 8 Comm: kworker/u16:0 Tainted: G W 5.5.0-next-20200205+ #339 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 Workqueue: kacpi_hotplug acpi_hotplug_work_fn RIP: 0010:__memset+0x24/0x30 Call Trace: sparse_add_section+0x150/0x1d8 __add_pages+0xbf/0x150 add_pages+0x12/0x60 add_memory_resource+0xc8/0x210 ? wake_up_q+0xa0/0xa0 __add_memory+0x62/0xb0 acpi_memory_device_add+0x13f/0x300 acpi_bus_attach+0xf6/0x200 acpi_bus_scan+0x43/0x90 acpi_device_hotplug+0x275/0x3d0 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 We should use memmap as it did. Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") Signed-off-by: Wei Yang Acked-by: David Hildenbrand Reviewed-by: Baoquan He CC: Dan Williams Signed-off-by: Baoquan He --- mm/sparse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/sparse.c b/mm/sparse.c index a7e78bfe0dce..623755e88255 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -944,7 +944,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn, * Poison uninitialized struct pages in order to catch invalid flags * combinations. */ - page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages); + page_init_poison(memmap, sizeof(struct page) * nr_pages); ms = __nr_to_section(section_nr); set_section_nid(section_nr, nid); -- 2.17.2