!2644 [sync] PR-2543: psi: fix "no previous prototype" warnings when CONFIG_CGROUPS=n

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/2543 
 
PR sync from: Lu Jialin <lujialin4@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3TW5B65JWNOSM3KM5L4O5NBHNMLDZTAB/ 
 
https://gitee.com/openeuler/kernel/issues/I89DEJ 
 
Link:https://gitee.com/openeuler/kernel/pulls/2644

 

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