Now memcg in unmap_and_move checks BUG_ON of charge.
But mem_cgroup_prepare_migration returns either 0 or -ENOMEM.
If it returns -ENOMEM, it jumps out unlock without the check.
If it returns 0, it can pass BUG_ON. So it's meaningless.
Let's remove it.
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Acked-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
---
mm/migrate.c | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index eb083a6..2abc9c9 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -683,7 +683,6 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
rc = -ENOMEM;
goto unlock;
}
- BUG_ON(charge);
if (PageWriteback(page)) {
if (!force || !sync)
--
1.7.1
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