From patchwork Mon Jul 9 10:29:43 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yasuaki Ishimatsu X-Patchwork-Id: 1172141 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 5546740B31 for ; Mon, 9 Jul 2012 10:32:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753120Ab2GIKaF (ORCPT ); Mon, 9 Jul 2012 06:30:05 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:57898 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753115Ab2GIKaD (ORCPT ); Mon, 9 Jul 2012 06:30:03 -0400 Received: from m4.gw.fujitsu.co.jp (unknown [10.0.50.74]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id 260933EE0BD; Mon, 9 Jul 2012 19:30:03 +0900 (JST) Received: from smail (m4 [127.0.0.1]) by outgoing.m4.gw.fujitsu.co.jp (Postfix) with ESMTP id 0424C45DE4E; Mon, 9 Jul 2012 19:30:03 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (s4.gw.fujitsu.co.jp [10.0.50.94]) by m4.gw.fujitsu.co.jp (Postfix) with ESMTP id DBF4A45DE50; Mon, 9 Jul 2012 19:30:02 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id CF84D1DB802F; Mon, 9 Jul 2012 19:30:02 +0900 (JST) Received: from g01jpexchyt12.g01.fujitsu.local (g01jpexchyt12.g01.fujitsu.local [10.128.194.51]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id 806451DB8037; Mon, 9 Jul 2012 19:30:02 +0900 (JST) Received: from [127.0.0.1] (10.124.101.33) by g01jpexchyt12.g01.fujitsu.local (10.128.194.51) with Microsoft SMTP Server id 14.2.309.2; Mon, 9 Jul 2012 19:29:57 +0900 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FFAB297.4020303@jp.fujitsu.com> Date: Mon, 9 Jul 2012 19:29:43 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: , , , CC: , , , , , , , , , Subject: [RFC PATCH v3 8/13] memory-hotplug : check page type in get_page_bootmem References: <4FFAB0A2.8070304@jp.fujitsu.com> In-Reply-To: <4FFAB0A2.8070304@jp.fujitsu.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org There is a possibility that get_page_bootmem() is called to the same page many times. So when get_page_bootmem is called to the same page, the function only increments page->_count. CC: David Rientjes CC: Jiang Liu CC: Len Brown CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Christoph Lameter Cc: Minchan Kim CC: Andrew Morton CC: KOSAKI Motohiro CC: Wen Congyang Signed-off-by: Yasuaki Ishimatsu --- mm/memory_hotplug.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-3.5-rc4/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-07-03 14:22:10.170116406 +0900 +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-07-03 14:22:12.299089413 +0900 @@ -95,10 +95,17 @@ static void release_memory_resource(stru static void get_page_bootmem(unsigned long info, struct page *page, unsigned long type) { - page->lru.next = (struct list_head *) type; - SetPagePrivate(page); - set_page_private(page, info); - atomic_inc(&page->_count); + unsigned long page_type; + + page_type = (unsigned long) page->lru.next; + if (type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || + type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE){ + page->lru.next = (struct list_head *) type; + SetPagePrivate(page); + set_page_private(page, info); + atomic_inc(&page->_count); + } else + atomic_inc(&page->_count); } /* reference to __meminit __free_pages_bootmem is valid