From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx108.postini.com [74.125.245.108]) by kanga.kvack.org (Postfix) with SMTP id BA2B76B0069 for ; Thu, 28 Jun 2012 03:01:24 -0400 (EDT) Received: from m2.gw.fujitsu.co.jp (unknown [10.0.50.72]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id 4B7283EE0BB for ; Thu, 28 Jun 2012 16:01:23 +0900 (JST) Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 2F83845DE72 for ; Thu, 28 Jun 2012 16:01:23 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 14A1145DE6E for ; Thu, 28 Jun 2012 16:01:23 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 039E81DB8042 for ; Thu, 28 Jun 2012 16:01:23 +0900 (JST) Received: from g01jpexchkw02.g01.fujitsu.local (g01jpexchkw02.g01.fujitsu.local [10.0.194.41]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id AC6A81DB803F for ; Thu, 28 Jun 2012 16:01:22 +0900 (JST) Message-ID: <4FEC012E.5030209@jp.fujitsu.com> Date: Thu, 28 Jun 2012 16:01:02 +0900 From: Yasuaki Ishimatsu MIME-Version: 1.0 Subject: Re: [RFC PATCH 2/12] memory-hogplug : check memory offline in offline_pages References: <4FEA9C88.1070800@jp.fujitsu.com> <4FEA9DB1.7010303@jp.fujitsu.com> In-Reply-To: Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, 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, wency@cn.fujitsu.com Hi David, 2012/06/27 15:16, David Rientjes wrote: > On Wed, 27 Jun 2012, Yasuaki Ishimatsu wrote: > >> Index: linux-3.5-rc4/mm/memory_hotplug.c >> =================================================================== >> --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-06-26 13:28:16.743211538 +0900 >> +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-06-26 13:48:38.264940468 +0900 >> @@ -887,6 +887,11 @@ static int __ref offline_pages(unsigned >> >> lock_memory_hotplug(); >> >> + if (memory_is_offline(start_pfn, end_pfn)) { >> + ret = 0; >> + goto out; >> + } >> + >> zone = page_zone(pfn_to_page(start_pfn)); >> node = zone_to_nid(zone); >> nr_pages = end_pfn - start_pfn; > > Are there additional prerequisites for this patch? Otherwise it changes > the return value of offline_memory() which will now call > acpi_memory_powerdown_device() in the acpi memhotplug case when disabling. > Is that a problem? I have understood there is a person who expects "offline_pages()" to fail in this case by kosaki's comment. So I'll move memory_is_offline to caller side. Thanks, Yasuaki Ishimatsu > > -- > 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 > -- 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