linux-kernel - kernel/sched/rt.c:257:6: warning: no previous declaration for 'unregister_rt_sched

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Date:   Fri, 24 Jun 2022 05:37:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mathias Krause <minipli@...ecurity.net>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: kernel/sched/rt.c:257:6: warning: no previous declaration for
 'unregister_rt_sched_group'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92f20ff72066d8d7e2ffb655c2236259ac9d1c5d
commit: b027789e5e50494c2325cc70c8642e7fd6059479 sched/fair: Prevent dead task groups from regaining cfs_rq's
date:   7 months ago
config: i386-randconfig-a004-20220620 (https://download.01.org/0day-ci/archive/20220624/202206240552.NqXLKyZT-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b027789e5e50494c2325cc70c8642e7fd6059479
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b027789e5e50494c2325cc70c8642e7fd6059479
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> kernel/sched/rt.c:257:6: warning: no previous declaration for 'unregister_rt_sched_group' [-Wmissing-declarations]
    void unregister_rt_sched_group(struct task_group *tg) { }
         ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/rt.c:259:6: warning: no previous declaration for 'free_rt_sched_group' [-Wmissing-declarations]
    void free_rt_sched_group(struct task_group *tg) { }
         ^~~~~~~~~~~~~~~~~~~
   kernel/sched/rt.c:261:5: warning: no previous declaration for 'alloc_rt_sched_group' [-Wmissing-declarations]
    int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
        ^~~~~~~~~~~~~~~~~~~~
   kernel/sched/rt.c:675:6: warning: no previous declaration for 'sched_rt_bandwidth_account' [-Wmissing-declarations]
    bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/unregister_rt_sched_group +257 kernel/sched/rt.c

   256	
 > 257	void unregister_rt_sched_group(struct task_group *tg) { }
   258	

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https://01.org/lkp