!1200 [sync] PR-1190: memcg: fix implicit declaration of memcg_print_bad_task()

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1190 
 
PR sync from: Liu Shixin <liushixin2@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/XR7NP7IV7MBMBYASGLC3ZEO7URQ2IHV7/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1200 

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

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 */