From patchwork Thu Mar 21 04:44:42 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yasuaki Ishimatsu X-Patchwork-Id: 2311021 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 460C8DF264 for ; Thu, 21 Mar 2013 04:45:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753328Ab3CUEpG (ORCPT ); Thu, 21 Mar 2013 00:45:06 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:37165 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752974Ab3CUEpG (ORCPT ); Thu, 21 Mar 2013 00:45:06 -0400 Received: from m2.gw.fujitsu.co.jp (unknown [10.0.50.72]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id 19A253EE0AE; Thu, 21 Mar 2013 13:45:05 +0900 (JST) Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 0105845DD78; Thu, 21 Mar 2013 13:45:05 +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 DED0D45DE4D; Thu, 21 Mar 2013 13:45:04 +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 D22D3E38001; Thu, 21 Mar 2013 13:45:04 +0900 (JST) Received: from g01jpexchkw03.g01.fujitsu.local (g01jpexchkw03.g01.fujitsu.local [10.0.194.42]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 8B8ED1DB8038; Thu, 21 Mar 2013 13:45:04 +0900 (JST) Received: from [127.0.0.1] (10.124.101.33) by g01jpexchkw03.g01.fujitsu.local (10.0.194.42) with Microsoft SMTP Server id 14.2.309.2; Thu, 21 Mar 2013 13:45:04 +0900 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <514A903A.9000909@jp.fujitsu.com> Date: Thu, 21 Mar 2013 13:44:42 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130307 Thunderbird/17.0.4 MIME-Version: 1.0 To: Toshi Kani , CC: , , , , Subject: Re: [Bug fix PATCH v2 1/2] ACPI, acpi_memhotplug: enable acpi_memory_info->enabled of memory device presented at boot-time References: <514022BF.3080303@jp.fujitsu.com> <1363186213.12845.174.camel@misato.fc.hp.com> <514679BC.5020700@jp.fujitsu.com> <1363705437.11659.5.camel@misato.fc.hp.com> <514A4CCD.6000608@jp.fujitsu.com> <514A8E3C.1050902@jp.fujitsu.com> In-Reply-To: <514A8E3C.1050902@jp.fujitsu.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The mail's tab become spaces. So I attached origianl patch. Thanks, Yasuaki Ishimatsu 2013/03/21 13:36, Yasuaki Ishimatsu wrote: > At http://marc.info/?l=linux-acpi&m=135769405622667&w=2 thread, > Toshi Kani mentioned as follows: > > "I have a question about the change you made in commit 65479472 in > acpi_memhotplug.c. This change seems to require that > acpi_memory_enable_device() calls add_memory() to add all memory ranges > represented by memory device objects at boot-time, and keep the results > be used for hot-remove. > > If I understand it right, this add_memory() call fails with EEXIST at > boot-time since all memory ranges should have been added from EFI memory > table (or e820) already. This results all memory ranges be marked as ! > enabled & !failed. I think this means that we cannot hot-delete any > memory ranges presented at boot-time since acpi_memory_remove_memory() > only calls remove_memory() when the enabled flag is set. Is that > correct?" > > Above mention is correct. Thus even if memory device supports hotplug, > memory presented at boot-time cannot be hot removed since the memory > device's acpi_memory_info->enabled is always 0. > > This patch changes to set 1 to "acpi_memory_info->enabled" of memory > device presented at boot-time for hot removing the memory device. > > Signed-off-by: Yasuaki Ishimatsu > --- > > v2 : Changed a based kernel from linux-3.9-rc2 to linux-pm.git/bleeding-edge. > > --- > drivers/acpi/acpi_memhotplug.c | 4 ++-- > 1 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c > index d4f2eb8..ea78988 100644 > --- a/drivers/acpi/acpi_memhotplug.c > +++ b/drivers/acpi/acpi_memhotplug.c > @@ -206,8 +206,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) > continue; > } > > - if (!result) > - info->enabled = 1; > + info->enabled = 1; > + > /* > * Add num_enable even if add_memory() returns -EEXIST, so the > * device is bound to this driver. > > -- > 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 At http://marc.info/?l=linux-acpi&m=135769405622667&w=2 thread, Toshi Kani mentioned as follows: "I have a question about the change you made in commit 65479472 in acpi_memhotplug.c. This change seems to require that acpi_memory_enable_device() calls add_memory() to add all memory ranges represented by memory device objects at boot-time, and keep the results be used for hot-remove. If I understand it right, this add_memory() call fails with EEXIST at boot-time since all memory ranges should have been added from EFI memory table (or e820) already. This results all memory ranges be marked as ! enabled & !failed. I think this means that we cannot hot-delete any memory ranges presented at boot-time since acpi_memory_remove_memory() only calls remove_memory() when the enabled flag is set. Is that correct?" Above mention is correct. Thus even if memory device supports hotplug, memory presented at boot-time cannot be hot removed since the memory device's acpi_memory_info->enabled is always 0. This patch changes to set 1 to "acpi_memory_info->enabled" of memory device presented at boot-time for hot removing the memory device. Signed-off-by: Yasuaki Ishimatsu --- v2 : Changed a based kernel from linux-3.9-rc2 to linux-pm.git/bleeding-edge. --- drivers/acpi/acpi_memhotplug.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index d4f2eb8..ea78988 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -206,8 +206,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) continue; } - if (!result) - info->enabled = 1; + info->enabled = 1; + /* * Add num_enable even if add_memory() returns -EEXIST, so the * device is bound to this driver. -- 1.7.1