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Subject[rcu:dev.2020.02.12a 109/124] kernel/torture.c:239:3: error: implicit declaration of function 'rcutorture_sched_setaffinity'; did you mean '__NR_ia32_sched_setaffinity'?
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.02.12a
head: 35a305226917a71de1c060db96fed0520cf644d9
commit: bc3db9afb8492662a1108616342f288de66baa8f [109/124] EXP: rcutorture hack to force CPU hotplug onto CPU 0
config: x86_64-randconfig-s0-20200215 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-4) 7.5.0
reproduce:
git checkout bc3db9afb8492662a1108616342f288de66baa8f
# 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 '__NR_ia32_sched_setaffinity'? [-Werror=implicit-function-declaration]
rcutorture_sched_setaffinity(current->pid, cpumask_of(0));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
__NR_ia32_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

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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