[PATCH 4] mm: fix possible incorrect return value of move_pages() syscall

[Joonsoo Kim]

move_pages() syscall may return success in case that
do_move_page_to_node_array return positive value which means migration failed.
This patch changes return value of do_move_page_to_node_array
for not returning positive value. It can fix the problem.

Signed-off-by: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Brice Goglin <brice@xxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>

diff --git a/mm/migrate.c b/mm/migrate.c
index 294d52a..adabaf4 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1171,7 +1171,7 @@ set_status:
 	}
 
 	up_read(&mm->mmap_sem);
-	return err;
+	return err > 0 ? -EIO : err;
 }
 
 /*
-- 
1.7.9.5

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