From patchwork Mon Dec 24 12:09:13 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tang Chen X-Patchwork-Id: 208071 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id A9DD82C0499 for ; Mon, 24 Dec 2012 23:14:15 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753229Ab2LXMN7 (ORCPT ); Mon, 24 Dec 2012 07:13:59 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:12358 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752473Ab2LXMK3 (ORCPT ); Mon, 24 Dec 2012 07:10:29 -0500 X-IronPort-AV: E=Sophos;i="4.84,347,1355068800"; d="scan'208";a="6464032" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 24 Dec 2012 20:08:27 +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 qBOCARc8016667; Mon, 24 Dec 2012 20:10:27 +0800 Received: from tangchen.fnst.cn.fujitsu.com ([10.167.225.117]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2012122420101295-582948 ; Mon, 24 Dec 2012 20:10:12 +0800 From: Tang Chen To: akpm@linux-foundation.org, rientjes@google.com, liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org, paulus@samba.org, cl@linux.com, minchan.kim@gmail.com, kosaki.motohiro@jp.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, wujianguo@huawei.com, wency@cn.fujitsu.com, tangchen@cn.fujitsu.com, hpa@zytor.com, linfeng@cn.fujitsu.com, laijs@cn.fujitsu.com, mgorman@suse.de, yinghai@kernel.org Cc: x86@kernel.org, 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, sparclinux@vger.kernel.org Subject: [PATCH v5 03/14] memory-hotplug: remove redundant codes Date: Mon, 24 Dec 2012 20:09:13 +0800 Message-Id: <1356350964-13437-4-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1356350964-13437-1-git-send-email-tangchen@cn.fujitsu.com> References: <1356350964-13437-1-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/12/24 20:10:12, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/12/24 20:10:14, Serialize complete at 2012/12/24 20:10:14 Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org From: Wen Congyang offlining memory blocks and checking whether memory blocks are offlined are very similar. This patch introduces a new function to remove redundant codes. Signed-off-by: Wen Congyang --- mm/memory_hotplug.c | 101 ++++++++++++++++++++++++++++----------------------- 1 files changed, 55 insertions(+), 46 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index d43d97b..dbb04d8 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1381,20 +1381,14 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages) return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); } -int remove_memory(u64 start, u64 size) +static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, + void *arg, int (*func)(struct memory_block *, void *)) { struct memory_block *mem = NULL; struct mem_section *section; - unsigned long start_pfn, end_pfn; unsigned long pfn, section_nr; int ret; - int return_on_error = 0; - int retry = 0; - - start_pfn = PFN_DOWN(start); - end_pfn = start_pfn + PFN_DOWN(size); -repeat: for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { section_nr = pfn_to_section_nr(pfn); if (!present_section_nr(section_nr)) @@ -1411,22 +1405,61 @@ repeat: if (!mem) continue; - ret = offline_memory_block(mem); + ret = func(mem, arg); if (ret) { - if (return_on_error) { - kobject_put(&mem->dev.kobj); - return ret; - } else { - retry = 1; - } + kobject_put(&mem->dev.kobj); + return ret; } } if (mem) kobject_put(&mem->dev.kobj); - if (retry) { - return_on_error = 1; + return 0; +} + +static int offline_memory_block_cb(struct memory_block *mem, void *arg) +{ + int *ret = arg; + int error = offline_memory_block(mem); + + if (error != 0 && *ret == 0) + *ret = error; + + return 0; +} + +static int is_memblock_offlined_cb(struct memory_block *mem, void *arg) +{ + int ret = !is_memblock_offlined(mem); + + if (unlikely(ret)) + pr_warn("removing memory fails, because memory " + "[%#010llx-%#010llx] is onlined\n", + PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)), + PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1); + + return ret; +} + +int remove_memory(u64 start, u64 size) +{ + unsigned long start_pfn, end_pfn; + int ret = 0; + int retry = 1; + + start_pfn = PFN_DOWN(start); + end_pfn = start_pfn + PFN_DOWN(size); + +repeat: + walk_memory_range(start_pfn, end_pfn, &ret, + offline_memory_block_cb); + if (ret) { + if (!retry) + return ret; + + retry = 0; + ret = 0; goto repeat; } @@ -1444,37 +1477,13 @@ repeat: * memory blocks are offlined. */ - for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { - section_nr = pfn_to_section_nr(pfn); - if (!present_section_nr(section_nr)) - continue; - - section = __nr_to_section(section_nr); - /* same memblock? */ - if (mem) - if ((section_nr >= mem->start_section_nr) && - (section_nr <= mem->end_section_nr)) - continue; - - mem = find_memory_block_hinted(section, mem); - if (!mem) - continue; - - ret = is_memblock_offlined(mem); - if (!ret) { - pr_warn("removing memory fails, because memory " - "[%#010llx-%#010llx] is onlined\n", - PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)), - PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1)) - 1); - - kobject_put(&mem->dev.kobj); - unlock_memory_hotplug(); - return ret; - } + ret = walk_memory_range(start_pfn, end_pfn, NULL, + is_memblock_offlined_cb); + if (ret) { + unlock_memory_hotplug(); + return ret; } - if (mem) - kobject_put(&mem->dev.kobj); unlock_memory_hotplug(); return 0;