From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by kanga.kvack.org (Postfix) with ESMTP id 2BF4B6B0261 for ; Thu, 31 Mar 2016 22:07:21 -0400 (EDT) Received: by mail-pa0-f50.google.com with SMTP id tt10so79032920pab.3 for ; Thu, 31 Mar 2016 19:07:21 -0700 (PDT) Received: from mail-pa0-x232.google.com (mail-pa0-x232.google.com. [2607:f8b0:400e:c03::232]) by mx.google.com with ESMTPS id 83si17757717pfl.78.2016.03.31.19.07.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 31 Mar 2016 19:07:20 -0700 (PDT) Received: by mail-pa0-x232.google.com with SMTP id fe3so79136791pab.1 for ; Thu, 31 Mar 2016 19:07:20 -0700 (PDT) From: js1304@gmail.com Subject: [PATCH v2 5/5] power: add zone range overlapping check Date: Fri, 1 Apr 2016 11:06:46 +0900 Message-Id: <1459476406-28418-6-git-send-email-iamjoonsoo.kim@lge.com> In-Reply-To: <1459476406-28418-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1459476406-28418-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Rik van Riel , Johannes Weiner , Mel Gorman , Laura Abbott , Minchan Kim , Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K.V" , Vlastimil Babka , "Rafael J. Wysocki" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim From: Joonsoo Kim There is a system that node's pfn are overlapped like as following. -----pfn--------> N0 N1 N2 N0 N1 N2 Therefore, we need to care this overlapping when iterating pfn range. mark_free_pages() iterates requested zone's pfn range and unset all range's bitmap first. And then it marks freepages in a zone to the bitmap. If there is an overlapping zone, above unset could clear previous marked bit and reference to this bitmap in the future will cause the problem. To prevent it, this patch adds a zone check in mark_free_pages(). Signed-off-by: Joonsoo Kim --- mm/page_alloc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 0cfee62..437a934 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2156,6 +2156,10 @@ void mark_free_pages(struct zone *zone) for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) if (pfn_valid(pfn)) { page = pfn_to_page(pfn); + + if (page_zone(page) != zone) + continue; + if (!swsusp_page_is_forbidden(page)) swsusp_unset_page_free(page); } -- 1.9.1 -- 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