From patchwork Fri Jul 27 10:31:28 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Congyang X-Patchwork-Id: 1248041 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 455123FDD9 for ; Fri, 27 Jul 2012 10:26:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752898Ab2G0K0b (ORCPT ); Fri, 27 Jul 2012 06:26:31 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:34952 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752022Ab2G0K02 (ORCPT ); Fri, 27 Jul 2012 06:26:28 -0400 X-IronPort-AV: E=Sophos;i="4.77,666,1336320000"; d="scan'208";a="5496391" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 27 Jul 2012 18:25:30 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id q6RAQPwQ001450; Fri, 27 Jul 2012 18:26:25 +0800 Received: from [10.167.225.226] ([10.167.225.226]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2012072718265558-903835 ; Fri, 27 Jul 2012 18:26:55 +0800 Message-ID: <50126E00.9000906@cn.fujitsu.com> Date: Fri, 27 Jul 2012 18:31:28 +0800 From: Wen Congyang User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100413 Fedora/3.0.4-2.fc13 Thunderbird/3.0.4 MIME-Version: 1.0 To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-ia64@vger.kernel.org, cmetcalf@tilera.com 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, Yasuaki ISIMATU Subject: [RFC PATCH v5 11/19] memory-hotplug: remove_memory calls __remove_pages References: <50126B83.3050201@cn.fujitsu.com> In-Reply-To: <50126B83.3050201@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/07/27 18:26:55, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/07/27 18:26:57, Serialize complete at 2012/07/27 18:26:57 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org From: Yasuaki Ishimatsu The patch adds __remove_pages() to remove_memory(). Then the range of phys_start_pfn argument and nr_pages argument in __remove_pagse() may have different zone. So zone argument is removed from __remove_pages() and __remove_pages() caluculates zone in each section. When CONFIG_SPARSEMEM_VMEMMAP is defined, there is no way to remove a memmap. So __remove_section only calls unregister_memory_section(). 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 --- arch/powerpc/platforms/pseries/hotplug-memory.c | 5 +---- include/linux/memory_hotplug.h | 3 +-- mm/memory_hotplug.c | 18 +++++++++++------- 3 files changed, 13 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index dc0a035..cc14da4 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -76,7 +76,6 @@ unsigned long memory_block_size_bytes(void) static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) { unsigned long start, start_pfn; - struct zone *zone; int i, ret; int sections_to_remove; @@ -87,8 +86,6 @@ static int pseries_remove_memblock(unsigned long base, unsigned int memblock_siz return 0; } - zone = page_zone(pfn_to_page(start_pfn)); - /* * Remove section mappings and sysfs entries for the * section of the memory we are removing. @@ -101,7 +98,7 @@ static int pseries_remove_memblock(unsigned long base, unsigned int memblock_siz sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION; for (i = 0; i < sections_to_remove; i++) { unsigned long pfn = start_pfn + i * PAGES_PER_SECTION; - ret = __remove_pages(zone, start_pfn, PAGES_PER_SECTION); + ret = __remove_pages(start_pfn, PAGES_PER_SECTION); if (ret) return ret; } diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index fd84ea9..8bf820d 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -90,8 +90,7 @@ extern bool is_pageblock_removable_nolock(struct page *page); /* reasonably generic interface to expand the physical pages in a zone */ extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn, unsigned long nr_pages); -extern int __remove_pages(struct zone *zone, unsigned long start_pfn, - unsigned long nr_pages); +extern int __remove_pages(unsigned long start_pfn, unsigned long nr_pages); #ifdef CONFIG_NUMA extern int memory_add_physaddr_to_nid(u64 start); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index d360c5c..a9e1579 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -275,11 +275,14 @@ static int __meminit __add_section(int nid, struct zone *zone, #ifdef CONFIG_SPARSEMEM_VMEMMAP static int __remove_section(struct zone *zone, struct mem_section *ms) { - /* - * XXX: Freeing memmap with vmemmap is not implement yet. - * This should be removed later. - */ - return -EBUSY; + int ret = -EINVAL; + + if (!valid_section(ms)) + return ret; + + ret = unregister_memory_section(ms); + + return ret; } #else static int __remove_section(struct zone *zone, struct mem_section *ms) @@ -346,11 +349,11 @@ EXPORT_SYMBOL_GPL(__add_pages); * sure that pages are marked reserved and zones are adjust properly by * calling offline_pages(). */ -int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, - unsigned long nr_pages) +int __remove_pages(unsigned long phys_start_pfn, unsigned long nr_pages) { unsigned long i, ret = 0; int sections_to_remove; + struct zone *zone; /* * We can only remove entire sections @@ -363,6 +366,7 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, sections_to_remove = nr_pages / PAGES_PER_SECTION; for (i = 0; i < sections_to_remove; i++) { unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; + zone = page_zone(pfn_to_page(pfn)); ret = __remove_section(zone, __pfn_to_section(pfn)); if (ret) break;