--- mm/memcontrol.c

+++ mm/memcontrol.c

@@ -2008,12 +2008,12 @@ int mem_cgroup_prepare_migration(struct

}

unlock_page_cgroup(pc);

+ *ptr = mem;

if (mem) {

- ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false,

+ ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, ptr, false,

page);

css_put(&mem->css);

}

- *ptr = mem;

return ret;

}