linux-kernel - [PATCH 3/4] mem-hotplug: Skip LOCAL_NODE_DATA pages in memory online procedure.

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Date:	Fri, 24 May 2013 17:30:06 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	akpm@...ux-foundation.org, mgorman@...e.de, mingo@...hat.com,
	hpa@...or.com, minchan@...nel.org, wency@...fujitsu.com,
	laijs@...fujitsu.com, yinghai@...nel.org, jiang.liu@...wei.com,
	tj@...nel.org, liwanp@...ux.vnet.ibm.com,
	isimatu.yasuaki@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] mem-hotplug: Skip LOCAL_NODE_DATA pages in memory online procedure.

Pages marked as LOCAL_NODE_DATA are skipped when we do memory offline.
So we have to skip them again when we do memory online.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 mm/memory_hotplug.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 075d412..21d6fcb 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -825,12 +825,18 @@ static void generic_online_page(struct page *page)
 static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
 			void *arg)
 {
-	unsigned long i;
+	unsigned long i, magic;
 	unsigned long onlined_pages = *(unsigned long *)arg;
 	struct page *page;
 	if (PageReserved(pfn_to_page(start_pfn)))
 		for (i = 0; i < nr_pages; i++) {
 			page = pfn_to_page(start_pfn + i);
+			magic = (unsigned long)page->lru.next;
+
+			/* Skip pages storing local node kernel data. */
+			if (magic == LOCAL_NODE_DATA)
+				continue;
+
 			(*online_page_callback)(page);
 			onlined_pages++;
 		}
-- 
1.7.1

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