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Subject[111/289] mm: fix return value of scan_lru_pages in memory unplug
2.6.36-stable review patch.  If anyone has any objections, please let us know.


From: KAMEZAWA Hiroyuki <>

commit f8f72ad5396987e05a42cf7eff826fb2a15ff148 upstream.

scan_lru_pages returns pfn. So, it's type should be "unsigned long"
not "int".

Note: I guess this has been work until now because memory hotplug tester's
machine has not very big memory....
physical address < 32bit << PAGE_SHIFT.

Reported-by: KOSAKI Motohiro <>
Signed-off-by: KAMEZAWA Hiroyuki <>
Reviewed-by: KOSAKI Motohiro <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>

mm/memory_hotplug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -659,7 +659,7 @@ static int test_pages_in_a_zone(unsigned
* Scanning pfn is much easier than scanning lru list.
* Scan pfn from start to end and Find LRU page.
-int scan_lru_pages(unsigned long start, unsigned long end)
+unsigned long scan_lru_pages(unsigned long start, unsigned long end)
unsigned long pfn;
struct page *page;

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