[qais-yousef:sched-setscheduler-hide 8/9] kernel/rcu/rcutorture.c:2409:3: error: call to undeclared function 'sched_setscheduler_nocheck'; ISO C99 and later do not support implicit function declarations

[qais-yousef:sched-setscheduler-hide 8/9] kernel/rcu/rcutorture.c:2409:3: error: call to undeclared function 'sched_setscheduler_nocheck'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://github.com/qais-yousef/linux sched-setscheduler-hide
head:   e586c67baa1c537a793f135e324cc56df2b6585b
commit: 66cbe87c50b34ba823e5542a7c699fcbe8663d5d [8/9] sched: Make sched_set{scheduler, attr}() static
config: i386-randconfig-r022-20230826 (https://download.01.org/0day-ci/archive/20230826/202308261704.SSuhTI8n-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230826/202308261704.SSuhTI8n-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308261704.SSuhTI8n-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/rcu/rcutorture.c:2409:3: error: call to undeclared function 'sched_setscheduler_nocheck'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
                   ^
   1 error generated.


vim +/sched_setscheduler_nocheck +2409 kernel/rcu/rcutorture.c

8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2391  
0ffd374b2207a1 kernel/rcu/rcutorture.c Sebastian Andrzej Siewior 2016-08-18  2392  static int rcutorture_booster_init(unsigned int cpu)
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2393  {
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2394  	int retval;
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2395  
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2396  	if (boost_tasks[cpu] != NULL)
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2397  		return 0;  /* Already created, nothing more to do. */
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2398  
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2399  	// Testing RCU priority boosting requires rcutorture do
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2400  	// some serious abuse.  Counter this by running ksoftirqd
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2401  	// at higher priority.
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2402  	if (IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)) {
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2403  		struct sched_param sp;
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2404  		struct task_struct *t;
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2405  
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2406  		t = per_cpu(ksoftirqd, cpu);
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2407  		WARN_ON_ONCE(!t);
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2408  		sp.sched_priority = 2;
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10 @2409  		sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2410  	}
3002153a91a973 kernel/rcu/rcutorture.c Frederic Weisbecker       2022-06-10  2411  
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2412  	/* Don't allow time recalculation while creating a new task. */
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2413  	mutex_lock(&boost_mutex);
450efca7182a51 kernel/rcu/rcutorture.c Joel Fernandes (Google    2018-06-10  2414) 	rcu_torture_disable_rt_throttle();
5ccf60f23d33af kernel/rcu/rcutorture.c Paul E. McKenney          2014-01-29  2415  	VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task");
3b9cb4ba4b54ec kernel/rcu/rcutorture.c Cai Huoqing               2022-01-14  2416  	boost_tasks[cpu] = kthread_run_on_cpu(rcu_torture_boost, NULL,
3b9cb4ba4b54ec kernel/rcu/rcutorture.c Cai Huoqing               2022-01-14  2417  					      cpu, "rcu_torture_boost_%u");
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2418  	if (IS_ERR(boost_tasks[cpu])) {
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2419  		retval = PTR_ERR(boost_tasks[cpu]);
5ccf60f23d33af kernel/rcu/rcutorture.c Paul E. McKenney          2014-01-29  2420  		VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed");
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2421  		n_rcu_torture_boost_ktrerror++;
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2422  		boost_tasks[cpu] = NULL;
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2423  		mutex_unlock(&boost_mutex);
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2424  		return retval;
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2425  	}
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2426  	mutex_unlock(&boost_mutex);
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2427  	return 0;
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2428  }
8e8be45e8e55da kernel/rcutorture.c     Paul E. McKenney          2010-09-02  2429  

:::::: The code at line 2409 was first introduced by commit
:::::: 3002153a91a9732a6d1d0bb95138593c7da15743 rcutorture: Fix ksoftirqd boosting timing and iteration

:::::: TO: Frederic Weisbecker <frederic@kernel.org>
:::::: CC: Paul E. McKenney <paulmck@kernel.org>

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