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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 0C3E5ECE587 for ; Tue, 1 Oct 2019 14:40:54 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 D25D52054F for ; Tue, 1 Oct 2019 14:40:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="s7XDiJ5/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D25D52054F 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-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=arB7Kydq9iOKZuiL90YmhqrHzXc3FMUWYHoz0u/jjXA=; b=s7XDiJ5/F43xXF qMoG75VZb4Lg1i0hPNeCdvYL0X+n5GVtphfkjsqpweGyWM3Dfjo9BnVCMVmkI1nW9PkOfnLjEQDBE oPISwmAIN106hIAl8EXjhfWiJevZlkMxkRmDlcaEgz/t0KaH2fKJ1vwTjNZaklfOkyvEB+O7LY39W Ux++wSisXM7zjcPTu2n3KZOgv+yKpinxcnJO3wHFRyAcf5kOv5qMf9NUMfaHucdjyuNWCrli9iqGV 9trreAVaCNfjbUYdYlqifEYTgidEcU39wxQLYDuzSSQX5uFWQKZj3Bo6jw/IRTf8Hm8JCOLkdPWEx lDF8cpvDDHqakTEMVSew==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iFJKZ-000202-QD; Tue, 01 Oct 2019 14:40:47 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iFJKW-0001yr-6Y for linux-arm-kernel@lists.infradead.org; Tue, 01 Oct 2019 14:40:45 +0000 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A07773082E42; Tue, 1 Oct 2019 14:40:43 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-54.ams2.redhat.com [10.36.116.54]) by smtp.corp.redhat.com (Postfix) with ESMTP id 782385D9E5; Tue, 1 Oct 2019 14:40:32 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Subject: [PATCH v5 01/10] mm/memunmap: Use the correct start and end pfn when removing pages from zone Date: Tue, 1 Oct 2019 16:40:02 +0200 Message-Id: <20191001144011.3801-2-david@redhat.com> In-Reply-To: <20191001144011.3801-1-david@redhat.com> References: <20191001144011.3801-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Tue, 01 Oct 2019 14:40:44 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191001_074044_273882_A2D10106 X-CRM114-Status: GOOD ( 15.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, linux-ia64@vger.kernel.org, Ira Weiny , linux-sh@vger.kernel.org, Jason Gunthorpe , "Aneesh Kumar K.V" , Pankaj Gupta , David Hildenbrand , linux-mm@kvack.org, Logan Gunthorpe , Dan Williams , linuxppc-dev@lists.ozlabs.org, Andrew Morton , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Aneesh Kumar K.V" With altmap, all the resource pfns are not initialized. While initializing pfn, altmap reserve space is skipped. Hence when removing pfn from zone skip pfns that were never initialized. Update memunmap_pages to calculate start and end pfn based on altmap values. This fixes a kernel crash that is observed when destroying a namespace. [ 81.356173] kernel BUG at include/linux/mm.h:1107! cpu 0x1: Vector: 700 (Program Check) at [c000000274087890] pc: c0000000004b9728: memunmap_pages+0x238/0x340 lr: c0000000004b9724: memunmap_pages+0x234/0x340 ... pid = 3669, comm = ndctl kernel BUG at include/linux/mm.h:1107! [c000000274087ba0] c0000000009e3500 devm_action_release+0x30/0x50 [c000000274087bc0] c0000000009e4758 release_nodes+0x268/0x2d0 [c000000274087c30] c0000000009dd144 device_release_driver_internal+0x174/0x240 [c000000274087c70] c0000000009d9dfc unbind_store+0x13c/0x190 [c000000274087cb0] c0000000009d8a24 drv_attr_store+0x44/0x60 [c000000274087cd0] c0000000005a7470 sysfs_kf_write+0x70/0xa0 [c000000274087d10] c0000000005a5cac kernfs_fop_write+0x1ac/0x290 [c000000274087d60] c0000000004be45c __vfs_write+0x3c/0x70 [c000000274087d80] c0000000004c26e4 vfs_write+0xe4/0x200 [c000000274087dd0] c0000000004c2a6c ksys_write+0x7c/0x140 [c000000274087e20] c00000000000bbd0 system_call+0x5c/0x68 Cc: Dan Williams Cc: Andrew Morton Cc: Jason Gunthorpe Cc: Logan Gunthorpe Cc: Ira Weiny Reviewed-by: Pankaj Gupta Signed-off-by: Aneesh Kumar K.V [ move all pfn-realted declarations into a single line ] Signed-off-by: David Hildenbrand --- mm/memremap.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/mm/memremap.c b/mm/memremap.c index 557e53c6fb46..026788b2ac69 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -123,7 +123,7 @@ static void dev_pagemap_cleanup(struct dev_pagemap *pgmap) void memunmap_pages(struct dev_pagemap *pgmap) { struct resource *res = &pgmap->res; - unsigned long pfn; + unsigned long pfn, nr_pages, start_pfn, end_pfn; int nid; dev_pagemap_kill(pgmap); @@ -131,14 +131,17 @@ void memunmap_pages(struct dev_pagemap *pgmap) put_page(pfn_to_page(pfn)); dev_pagemap_cleanup(pgmap); + start_pfn = pfn_first(pgmap); + end_pfn = pfn_end(pgmap); + nr_pages = end_pfn - start_pfn; + /* pages are dead and unused, undo the arch mapping */ - nid = page_to_nid(pfn_to_page(PHYS_PFN(res->start))); + nid = page_to_nid(pfn_to_page(start_pfn)); mem_hotplug_begin(); if (pgmap->type == MEMORY_DEVICE_PRIVATE) { - pfn = PHYS_PFN(res->start); - __remove_pages(page_zone(pfn_to_page(pfn)), pfn, - PHYS_PFN(resource_size(res)), NULL); + __remove_pages(page_zone(pfn_to_page(start_pfn)), start_pfn, + nr_pages, NULL); } else { arch_remove_memory(nid, res->start, resource_size(res), pgmap_altmap(pgmap)); -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel