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=-15.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 56A7CC433E6 for ; Wed, 13 Jan 2021 08:29:14 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E0FF423340 for ; Wed, 13 Jan 2021 08:29:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E0FF423340 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 49043100EB337; Wed, 13 Jan 2021 00:29:13 -0800 (PST) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=216.205.24.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=david@redhat.com; receiver= Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id E4339100EB334 for ; Wed, 13 Jan 2021 00:29:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610526549; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SnkNq7WMI2CVWcX/yAHgyPl0w9p5JWaNoF5mq+QCvB0=; b=JWaw/395giL7SrqN1yqJBJL5Ttl96cL/DO9EcBFuomRltIz+NUNZLUrYVvPwA9luADsCch BebzMpRgWveM+rsNHln5iqX658zkkNRbrlMz7a0uPVwjEkEWDUorTdX9ERwfmLS/yH5cPg 7H4RecTcE9lm6Uz80oMIpXd4/BtfijE= 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-577-XqfY1E7jNbO_kaHy5Xz8Hg-1; Wed, 13 Jan 2021 03:29:05 -0500 X-MC-Unique: XqfY1E7jNbO_kaHy5Xz8Hg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BAD7A801F98; Wed, 13 Jan 2021 08:29:03 +0000 (UTC) Received: from [10.36.114.135] (ovpn-114-135.ams2.redhat.com [10.36.114.135]) by smtp.corp.redhat.com (Postfix) with ESMTP id C095F7046A; Wed, 13 Jan 2021 08:29:01 +0000 (UTC) Subject: Re: [PATCH v3 2/6] mm: Teach pfn_to_online_page() to consider subsection validity To: Dan Williams , linux-mm@kvack.org References: <161052331545.1805594.2356512831689786960.stgit@dwillia2-desk3.amr.corp.intel.com> <161052332755.1805594.9846390935351758277.stgit@dwillia2-desk3.amr.corp.intel.com> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <230efa36-9192-fe52-b8b6-16b2feafb70b@redhat.com> Date: Wed, 13 Jan 2021 09:29:00 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <161052332755.1805594.9846390935351758277.stgit@dwillia2-desk3.amr.corp.intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Message-ID-Hash: JSY7JPLJJ2HDXLPJHSRK3BMEY5ZAQCTQ X-Message-ID-Hash: JSY7JPLJJ2HDXLPJHSRK3BMEY5ZAQCTQ X-MailFrom: david@redhat.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Qian Cai , Michal Hocko , Oscar Salvador , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 13.01.21 08:35, Dan Williams wrote: > pfn_section_valid() determines pfn validity on subsection granularity > where pfn_valid() may be limited to coarse section granularity. > Explicitly validate subsections after pfn_valid() succeeds. > > Fixes: b13bc35193d9 ("mm/hotplug: invalid PFNs from pfn_to_online_page()") > Cc: Qian Cai > Cc: Michal Hocko > Cc: Oscar Salvador > Reported-by: David Hildenbrand > Signed-off-by: Dan Williams > --- > mm/memory_hotplug.c | 24 ++++++++++++++++++++---- > 1 file changed, 20 insertions(+), 4 deletions(-) > > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 55a69d4396e7..9f37f8a68da4 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -308,11 +308,27 @@ static int check_hotplug_memory_addressable(unsigned long pfn, > struct page *pfn_to_online_page(unsigned long pfn) > { > unsigned long nr = pfn_to_section_nr(pfn); > + struct mem_section *ms; > + > + if (nr >= NR_MEM_SECTIONS) > + return NULL; > + > + ms = __nr_to_section(nr); > + if (!online_section(ms)) > + return NULL; > + > + /* > + * Save some code text when online_section() + > + * pfn_section_valid() are sufficient. > + */ > + if (IS_ENABLED(CONFIG_HAVE_ARCH_PFN_VALID)) > + if (!pfn_valid(pfn)) > + return NULL; Nit: if (IS_ENABLED(CONFIG_HAVE_ARCH_PFN_VALID) && !pfn_valid(pfn)) Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org