[PATCH v3 3/9] mm/page_owner: copy last_migrate_reason in copy_page_owner()

[js1304]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

Currently, copy_page_owner() doesn't copy all the owner information.  It
skips last_migrate_reason because copy_page_owner() is used for migration
and it will be properly set soon.  But, following patch will use
copy_page_owner() and this skip will cause the problem that allocated page
has uninitialied last_migrate_reason.  To prevent it, this patch also copy
last_migrate_reason in copy_page_owner().

Link: http://lkml.kernel.org/r/1464230275-25791-3-git-send-email-iamjoonsoo.kim@xxxxxxx
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
---
 mm/page_owner.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page_owner.c b/mm/page_owner.c
index c6cda3e..73e202f 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -118,6 +118,7 @@ void __copy_page_owner(struct page *oldpage, struct page *newpage)
 
 	new_ext->order = old_ext->order;
 	new_ext->gfp_mask = old_ext->gfp_mask;
+	new_ext->last_migrate_reason = old_ext->last_migrate_reason;
 	new_ext->nr_entries = old_ext->nr_entries;
 
 	for (i = 0; i < ARRAY_SIZE(new_ext->trace_entries); i++)
-- 
1.9.1