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=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 C0BB4C33CB3 for ; Wed, 15 Jan 2020 15:34:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 984632053B for ; Wed, 15 Jan 2020 15:34:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GIUZjYOB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728912AbgAOPeT (ORCPT ); Wed, 15 Jan 2020 10:34:19 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:41795 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729005AbgAOPeS (ORCPT ); Wed, 15 Jan 2020 10:34:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579102457; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=enpyKzeC1X3YABCaiQ7Mlo8dBePEp5sYNrJlGn2EajY=; b=GIUZjYOB3r/rj5k4rLhqoiPjGNIfK5+P9tTUW2bA6axIVp2FWQahSWptj+Ks1nn3FFPD1C TgHwUMTw0H7LwuiLs0d3LkuAT4S6NT7NS8vKBfIOM3ZNuPsLbayhH3Z2pyu1FZm/v+mQ4q LItSxAXwkadgjqk8FdASdaI17FLrlew= 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-11-uBOvwiX6M46_h4VeQHNYJA-1; Wed, 15 Jan 2020 10:34:10 -0500 X-MC-Unique: uBOvwiX6M46_h4VeQHNYJA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1CD2D92847B; Wed, 15 Jan 2020 15:34:09 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.36.118.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id E823B8886D; Wed, 15 Jan 2020 15:34:06 +0000 (UTC) From: David Hildenbrand To: stable@vger.kernel.org Cc: linux-mm@kvack.org, Oscar Salvador , Michal Hocko , "Aneesh Kumar K . V" , Greg Kroah-Hartman , Dan Williams , Andrew Morton , Laurent Vivier , Baoquan He , David Hildenbrand Subject: [PATCH for 4.19-stable 09/25] mm/memory_hotplug: make unregister_memory_section() never fail Date: Wed, 15 Jan 2020 16:33:23 +0100 Message-Id: <20200115153339.36409-10-david@redhat.com> In-Reply-To: <20200115153339.36409-1-david@redhat.com> References: <20200115153339.36409-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Content-Transfer-Encoding: quoted-printable Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org commit cb7b3a3685b20d3b5900ff24b2cb96d002960189 upstream. Failing while removing memory is mostly ignored and cannot really be handled. Let's treat errors in unregister_memory_section() in a nice way= , warning, but continuing. Link: http://lkml.kernel.org/r/20190409100148.24703-3-david@redhat.com Signed-off-by: David Hildenbrand Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Cc: Ingo Molnar Cc: Andrew Banman Cc: Mike Travis Cc: David Hildenbrand Cc: Oscar Salvador Cc: Michal Hocko Cc: Pavel Tatashin Cc: Qian Cai Cc: Wei Yang Cc: Arun KS Cc: Mathieu Malaterre Cc: Andy Lutomirski Cc: Benjamin Herrenschmidt Cc: Borislav Petkov Cc: Christophe Leroy Cc: Dave Hansen Cc: Fenghua Yu Cc: Geert Uytterhoeven Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Joonsoo Kim Cc: "Kirill A. Shutemov" Cc: Martin Schwidefsky Cc: Masahiro Yamada Cc: Michael Ellerman Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Oscar Salvador Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Rich Felker Cc: Rob Herring Cc: Stefan Agner Cc: Thomas Gleixner Cc: Tony Luck Cc: Vasily Gorbik Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: David Hildenbrand --- drivers/base/memory.c | 16 +++++----------- include/linux/memory.h | 2 +- mm/memory_hotplug.c | 4 +--- 3 files changed, 7 insertions(+), 15 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 119b076eb5e2..5b9950d982dc 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -743,15 +743,18 @@ unregister_memory(struct memory_block *memory) { BUG_ON(memory->dev.bus !=3D &memory_subsys); =20 - /* drop the ref. we got in remove_memory_section() */ + /* drop the ref. we got via find_memory_block() */ put_device(&memory->dev); device_unregister(&memory->dev); } =20 -static int remove_memory_section(struct mem_section *section) +void unregister_memory_section(struct mem_section *section) { struct memory_block *mem; =20 + if (WARN_ON_ONCE(!present_section(section))) + return; + mutex_lock(&mem_sysfs_mutex); =20 /* @@ -772,15 +775,6 @@ static int remove_memory_section(struct mem_section = *section) =20 out_unlock: mutex_unlock(&mem_sysfs_mutex); - return 0; -} - -int unregister_memory_section(struct mem_section *section) -{ - if (!present_section(section)) - return -EINVAL; - - return remove_memory_section(section); } #endif /* CONFIG_MEMORY_HOTREMOVE */ =20 diff --git a/include/linux/memory.h b/include/linux/memory.h index a6ddefc60517..e1dc1bb2b787 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -113,7 +113,7 @@ extern int register_memory_isolate_notifier(struct no= tifier_block *nb); extern void unregister_memory_isolate_notifier(struct notifier_block *nb= ); int hotplug_memory_register(int nid, struct mem_section *section); #ifdef CONFIG_MEMORY_HOTREMOVE -extern int unregister_memory_section(struct mem_section *); +extern void unregister_memory_section(struct mem_section *); #endif extern int memory_dev_init(void); extern int memory_notify(unsigned long val, void *v); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 418d589552b3..42c5bc371ffe 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -488,9 +488,7 @@ static int __remove_section(struct zone *zone, struct= mem_section *ms, if (!valid_section(ms)) return ret; =20 - ret =3D unregister_memory_section(ms); - if (ret) - return ret; + unregister_memory_section(ms); =20 scn_nr =3D __section_nr(ms); start_pfn =3D section_nr_to_pfn((unsigned long)scn_nr); --=20 2.24.1