From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx169.postini.com [74.125.245.169]) by kanga.kvack.org (Postfix) with SMTP id CE8D96B0068 for ; Tue, 3 Jul 2012 02:01:48 -0400 (EDT) Received: from m1.gw.fujitsu.co.jp (unknown [10.0.50.71]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id 67DF23EE0C0 for ; Tue, 3 Jul 2012 15:01:47 +0900 (JST) Received: from smail (m1 [127.0.0.1]) by outgoing.m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 4E44545DE55 for ; Tue, 3 Jul 2012 15:01:47 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (s1.gw.fujitsu.co.jp [10.0.50.91]) by m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 360E545DE58 for ; Tue, 3 Jul 2012 15:01:47 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 1EBDF1DB8058 for ; Tue, 3 Jul 2012 15:01:47 +0900 (JST) Received: from g01jpexchyt08.g01.fujitsu.local (g01jpexchyt08.g01.fujitsu.local [10.128.194.47]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id C43BF1DB8056 for ; Tue, 3 Jul 2012 15:01:46 +0900 (JST) Message-ID: <4FF28ABE.4010200@jp.fujitsu.com> Date: Tue, 3 Jul 2012 15:01:34 +0900 From: Yasuaki Ishimatsu MIME-Version: 1.0 Subject: [RFC PATCH v2 8/13] memory-hotplug : check page type in get_page_bootmem References: <4FF287C3.4030901@jp.fujitsu.com> In-Reply-To: <4FF287C3.4030901@jp.fujitsu.com> Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org Cc: rientjes@google.com, liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org, paulus@samba.org, cl@linux.com, minchan.kim@gmail.com, akpm@linux-foundation.org, kosaki.motohiro@jp.fujitsu.com 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 Signed-off-by: Yasuaki Ishimatsu --- mm/memory_hotplug.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org