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Subject[34-longterm 037/209] mm: fix return value of scan_lru_pages in memory unplug
From: KAMEZAWA Hiroyuki <>

| This is a commit scheduled for the next v2.6.34 longterm release. |
| If you see a problem with using this for longterm, please comment.|

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: Paul Gortmaker <>
mm/memory_hotplug.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 91f7c26..a577318 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -633,7 +633,7 @@ static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn)
* 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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