Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756127Ab2F0Fsv (ORCPT ); Wed, 27 Jun 2012 01:48:51 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:38762 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756075Ab2F0Fst (ORCPT ); Wed, 27 Jun 2012 01:48:49 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FEA9EAF.1060608@jp.fujitsu.com> Date: Wed, 27 Jun 2012 14:48:31 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: , , , CC: , , , , , , , Subject: [RFC PATCH 5/12] memory-hotplug : does not release memory region in PAGES_PER_SECTION chunks References: <4FEA9C88.1070800@jp.fujitsu.com> In-Reply-To: <4FEA9C88.1070800@jp.fujitsu.com> Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3391 Lines: 80 Since applying a patch(de7f0cba96786c), release_mem_region() has been changed as called in PAGES_PER_SECTION chunks because register_memory_resource() is called in PAGES_PER_SECTION chunks by add_memory(). But it seems firmware dependency. If CRS are written in the PAGES_PER_SECTION chunks in ACPI DSDT Table, register_memory_resource() is called in PAGES_PER_SECTION chunks. But if CRS are written in the DIMM unit in ACPI DSDT Table, register_memory_resource() is called in DIMM unit. So release_mem_region() should not be called in PAGES_PER_SECTION chunks. The patch fixes it. 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 | 13 +++++++++---- mm/memory_hotplug.c | 4 ++-- 2 files changed, 11 insertions(+), 6 deletions(-) Index: linux-3.5-rc4/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-06-26 13:50:57.075205100 +0900 +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-06-26 13:55:36.152716100 +0900 @@ -358,11 +358,11 @@ int __remove_pages(struct zone *zone, un BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); BUG_ON(nr_pages % PAGES_PER_SECTION); + release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE); + 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; - release_mem_region(pfn << PAGE_SHIFT, - PAGES_PER_SECTION << PAGE_SHIFT); ret = __remove_section(zone, __pfn_to_section(pfn)); if (ret) break; Index: linux-3.5-rc4/arch/powerpc/platforms/pseries/hotplug-memory.c =================================================================== --- linux-3.5-rc4.orig/arch/powerpc/platforms/pseries/hotplug-memory.c 2012-06-26 13:50:57.075205100 +0900 +++ linux-3.5-rc4/arch/powerpc/platforms/pseries/hotplug-memory.c 2012-06-26 13:55:36.153716088 +0900 @@ -77,7 +77,8 @@ static int pseries_remove_memblock(unsig { unsigned long start, start_pfn; struct zone *zone; - int ret; + int i, ret; + int sections_to_remove; start_pfn = base >> PAGE_SHIFT; @@ -97,9 +98,13 @@ static int pseries_remove_memblock(unsig * to sysfs "state" file and we can't remove sysfs entries * while writing to it. So we have to defer it to here. */ - ret = __remove_pages(zone, start_pfn, memblock_size >> PAGE_SHIFT); - if (ret) - return ret; + 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); + if (ret) + return ret; + } /* * Update memory regions for memory remove -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/