!1602 [sync] PR-1581: psi: fix compile error for psi cgroupv1 when CONFIG_CGROUP=n

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1581 
 
PR sync from: Lu Jialin <lujialin4@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/PC6T7HRTE7LIGXV2HL57QYEPFKPNYTCX/ 
 
https://gitee.com/openeuler/kernel/issues/I7OOZR 
 
Link:https://gitee.com/openeuler/kernel/pulls/1602 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

kernel/sched/cpuacct.c

@@ -390,6 +390,7 @@ static int __init setup_psi_v1(char *str)
 }
 __setup("psi_v1=", setup_psi_v1);
 
+extern struct cftype cgroup_v1_psi_files[];
 static int __init cgroup_v1_psi_init(void)
 {
 	if (!psi_v1_enable)

kernel/sched/sched.h

@@ -2950,10 +2950,6 @@ unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned
 }
 #endif
 
-#ifdef CONFIG_PSI
-extern struct cftype cgroup_v1_psi_files[];
-#endif
-
 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
 
 #define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))