From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx147.postini.com [74.125.245.147]) by kanga.kvack.org (Postfix) with SMTP id 6C2F58D0003 for ; Mon, 24 Dec 2012 07:10:31 -0500 (EST) From: Tang Chen Subject: [PATCH v5 07/14] memory-hotplug: move pgdat_resize_lock into sparse_remove_one_section() Date: Mon, 24 Dec 2012 20:09:17 +0800 Message-Id: <1356350964-13437-8-git-send-email-tangchen@cn.fujitsu.com> In-Reply-To: <1356350964-13437-1-git-send-email-tangchen@cn.fujitsu.com> References: <1356350964-13437-1-git-send-email-tangchen@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-ID: 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 In __remove_section(), we locked pgdat_resize_lock when calling sparse_remove_one_section(). This lock will disable irq. But we don't need to lock the whole function. If we do some work to free pagetables in free_section_usemap(), we need to call flush_tlb_all(), which need irq enabled. Otherwise the WARN_ON_ONCE() in smp_call_function_many() will be triggered. Signed-off-by: Tang Chen Signed-off-by: Lai Jiangshan Signed-off-by: Wen Congyang --- mm/memory_hotplug.c | 4 ---- mm/sparse.c | 5 ++++- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 34c656b..c12bd55 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -442,8 +442,6 @@ static int __remove_section(struct zone *zone, struct mem_section *ms) #else static int __remove_section(struct zone *zone, struct mem_section *ms) { - unsigned long flags; - struct pglist_data *pgdat = zone->zone_pgdat; int ret = -EINVAL; if (!valid_section(ms)) @@ -453,9 +451,7 @@ static int __remove_section(struct zone *zone, struct mem_section *ms) if (ret) return ret; - pgdat_resize_lock(pgdat, &flags); sparse_remove_one_section(zone, ms); - pgdat_resize_unlock(pgdat, &flags); return 0; } #endif diff --git a/mm/sparse.c b/mm/sparse.c index aadbb2a..05ca73a 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -796,8 +796,10 @@ static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) { struct page *memmap = NULL; - unsigned long *usemap = NULL; + unsigned long *usemap = NULL, flags; + struct pglist_data *pgdat = zone->zone_pgdat; + pgdat_resize_lock(pgdat, &flags); if (ms->section_mem_map) { usemap = ms->pageblock_flags; memmap = sparse_decode_mem_map(ms->section_mem_map, @@ -805,6 +807,7 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) ms->section_mem_map = 0; ms->pageblock_flags = NULL; } + pgdat_resize_unlock(pgdat, &flags); clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION); free_section_usemap(memmap, usemap); -- 1.7.1 -- 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