tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.02.05a
head:   7ce14e5d0186428062a09b295296daf5cf420d88
commit: 7ce14e5d0186428062a09b295296daf5cf420d88 [108/108] EXP: rcutorture hack to force CPU hotplug onto CPU 0
config: x86_64-randconfig-d003-20200206 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        git checkout 7ce14e5d0186428062a09b295296daf5cf420d88
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   kernel/torture.c: In function 'torture_onoff':
>> kernel/torture.c:239:3: error: implicit declaration of function 'rcutorture_sched_setaffinity'; did you mean 'sched_setaffinity'? [-Werror=implicit-function-declaration]
      rcutorture_sched_setaffinity(current->pid, cpumask_of(0));
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      sched_setaffinity
   cc1: some warnings being treated as errors

vim +239 kernel/torture.c

   195	
   196	/*
   197	 * Execute random CPU-hotplug operations at the interval specified
   198	 * by the onoff_interval.
   199	 */
   200	static int
   201	torture_onoff(void *arg)
   202	{
   203		int cpu;
   204		int maxcpu = -1;
   205		DEFINE_TORTURE_RANDOM(rand);
   206		int ret;
   207	
   208		VERBOSE_TOROUT_STRING("torture_onoff task started");
   209		for_each_online_cpu(cpu)
   210			maxcpu = cpu;
   211		WARN_ON(maxcpu < 0);
   212		if (!IS_MODULE(CONFIG_TORTURE_TEST))
   213			for_each_possible_cpu(cpu) {
   214				if (cpu_online(cpu))
   215					continue;
   216				ret = cpu_up(cpu);
   217				if (ret && verbose) {
   218					pr_alert("%s" TORTURE_FLAG
   219						 "%s: Initial online %d: errno %d\n",
   220						 __func__, torture_type, cpu, ret);
   221				}
   222			}
   223	
   224		if (maxcpu == 0) {
   225			VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");
   226			goto stop;
   227		}
   228	
   229		if (onoff_holdoff > 0) {
   230			VERBOSE_TOROUT_STRING("torture_onoff begin holdoff");
   231			schedule_timeout_interruptible(onoff_holdoff);
   232			VERBOSE_TOROUT_STRING("torture_onoff end holdoff");
   233		}
   234		while (!torture_must_stop()) {
   235			if (disable_onoff_at_boot && !rcu_inkernel_boot_has_ended()) {
   236				schedule_timeout_interruptible(HZ / 10);
   237				continue;
   238			}
 > 239			rcutorture_sched_setaffinity(current->pid, cpumask_of(0));
   240			cpu = (torture_random(&rand) >> 4) % (maxcpu + 1);
   241			if (!torture_offline(cpu,
   242					     &n_offline_attempts, &n_offline_successes,
   243					     &sum_offline, &min_offline, &max_offline))
   244				torture_online(cpu,
   245					       &n_online_attempts, &n_online_successes,
   246					       &sum_online, &min_online, &max_online);
   247			schedule_timeout_interruptible(onoff_interval);
   248		}
   249	
   250	stop:
   251		torture_kthread_stopping("torture_onoff");
   252		return 0;
   253	}
   254	

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