From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f180.google.com (mail-pd0-f180.google.com [209.85.192.180]) by kanga.kvack.org (Postfix) with ESMTP id 91DD66B0071 for ; Thu, 6 Nov 2014 03:09:15 -0500 (EST) Received: by mail-pd0-f180.google.com with SMTP id ft15so676490pdb.25 for ; Thu, 06 Nov 2014 00:09:15 -0800 (PST) Received: from mailout4.samsung.com (mailout4.samsung.com. [203.254.224.34]) by mx.google.com with ESMTPS id le15si5281905pab.45.2014.11.06.00.09.13 for (version=TLSv1 cipher=RC4-MD5 bits=128/128); Thu, 06 Nov 2014 00:09:14 -0800 (PST) Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NEL00LZDYN4NMC0@mailout4.samsung.com> for linux-mm@kvack.org; Thu, 06 Nov 2014 17:09:04 +0900 (KST) From: Weijie Yang Subject: [PATCH 1/2] mm: page_isolation: check pfn validity before access Date: Thu, 06 Nov 2014 16:08:02 +0800 Message-id: <000001cff998$ee0b31d0$ca219570$%yang@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 7bit Content-language: zh-cn Sender: owner-linux-mm@kvack.org List-ID: To: kamezawa.hiroyu@jp.fujitsu.com, 'Minchan Kim' Cc: 'Andrew Morton' , mgorman@suse.de, mina86@mina86.com, 'linux-kernel' , 'Linux-MM' , 'Weijie Yang' In the undo path of start_isolate_page_range(), we need to check the pfn validity before access its page, or it will trigger an addressing exception if there is hole in the zone. Signed-off-by: Weijie Yang --- mm/page_isolation.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index d1473b2..3ddc8b3 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -137,8 +137,11 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn, undo: for (pfn = start_pfn; pfn < undo_pfn; - pfn += pageblock_nr_pages) - unset_migratetype_isolate(pfn_to_page(pfn), migratetype); + pfn += pageblock_nr_pages) { + page = __first_valid_page(pfn, pageblock_nr_pages); + if (page) + unset_migratetype_isolate(page, migratetype); + } return -EBUSY; } -- 1.7.0.4 -- 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