memcg: fix implicit declaration of memcg_print_bad_task()

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I6NYW4
CVE: NA

--------------------------------

Fix implicit declaration of function 'memcg_print_bad_task'.

Fixes: 9cd6f55e ("mm: oom: move memcg_print_bad_task() out of mem_cgroup_scan_tasks()")
Signed-off-by: NLiu Shixin <liushixin2@huawei.com>
(cherry picked from commit c95fdec6)

include/linux/memcontrol.h

@@ -420,6 +420,8 @@ bool memcg_low_priority_scan_tasks(int (*)(struct task_struct *, void *),
 void memcg_print_bad_task(struct oom_control *oc);
 extern int sysctl_memcg_qos_handler(struct ctl_table *table,
 		int write, void __user *buffer, size_t *length, loff_t *ppos);
+#else
+void memcg_print_bad_task(struct oom_control *oc);
 #endif
 
 /*
@@ -1695,6 +1697,10 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 {
 	return 0;
 }
+
+static inline void memcg_print_bad_task(struct oom_control *oc)
+{
+}
 #endif /* CONFIG_MEMCG */
 
 /* idx can be of type enum memcg_stat_item or node_stat_item */