tree: https://android.googlesource.com/kernel/common android12-5.10 head: 09bd9e940e98acad0c854f75b31fc79a93cde981 commit: 09bd9e940e98acad0c854f75b31fc79a93cde981 [1/1] ANDROID: cpuhp/pause: schedule cpu_hotplug_work on resume cpu config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android12-5.10 git checkout 09bd9e940e98acad0c854f75b31fc79a93cde981 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the android-common/android12-5.10 HEAD 45ebb9628e49418f30d182a8af06cff34a0a06e8 builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): kernel/cpu.c:1158:5: warning: no previous prototype for '__pause_drain_rq' [-Wmissing-prototypes] 1158 | int __pause_drain_rq(struct cpumask *cpus) | ^~~~~~~~~~~~~~~~ kernel/cpu.c:1178:6: warning: no previous prototype for '__wait_drain_rq' [-Wmissing-prototypes] 1178 | void __wait_drain_rq(struct cpumask *cpus) | ^~~~~~~~~~~~~~~ kernel/cpu.c: In function 'resume_cpus': 1368 | cpuset_update_active_cpus_affine(cpumask_first(cpus)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | cpuset_update_active_cpus cc1: some warnings being treated as errors vim +1368 kernel/cpu.c 1325 1326 int resume_cpus(struct cpumask *cpus) 1327 { 1328 unsigned int cpu; 1329 int err = 0; 1330 u64 start_time = 0; 1331 int prev_prio; 1332 1333 start_time = sched_clock(); 1334 1335 cpu_maps_update_begin(); 1336 1337 if (cpu_hotplug_disabled) { 1338 err = -EBUSY; 1339 goto err_cpu_maps_update; 1340 } 1341 1342 /* Resuming an already active CPU isn't an error */ 1343 cpumask_andnot(cpus, cpus, cpu_active_mask); 1344 1345 for_each_cpu(cpu, cpus) { 1346 if (!cpu_online(cpu)) { 1347 err = -EBUSY; 1348 goto err_cpu_maps_update; 1349 } 1350 } 1351 1352 if (cpumask_empty(cpus)) 1353 goto err_cpu_maps_update; 1354 1355 for_each_cpu(cpu, cpus) 1356 set_cpu_active(cpu, true); 1357 1358 trace_android_rvh_resume_cpus(cpus, &err); 1359 if (err) 1360 goto err_cpu_maps_update; 1361 1362 prev_prio = pause_reduce_prio(); 1363 1364 /* Lazy Resume. Build domains through schedule a workqueue on 1365 * resuming cpu. This is so that the resuming cpu can work more 1366 * early, and cannot add additional load to other busy cpu. 1367 */ 1369 1370 cpus_write_lock(); 1371 1372 cpuhp_tasks_frozen = 0; 1373 1374 if (sched_cpus_activate(cpus)) { 1375 err = -EBUSY; 1376 goto err_cpus_write_unlock; 1377 } 1378 1379 /* 1380 * see pause_cpus. 1381 */ 1382 for_each_cpu(cpu, cpus) { 1383 struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); 1384 1385 st->state = CPUHP_ONLINE; 1386 st->target = st->state; 1387 } 1388 1389 err_cpus_write_unlock: 1390 cpus_write_unlock(); 1391 pause_restore_prio(prev_prio); 1392 err_cpu_maps_update: 1393 cpu_maps_update_done(); 1394 1395 trace_cpuhp_pause(cpus, start_time, 0); 1396 1397 return err; 1398 } 1399 EXPORT_SYMBOL_GPL(resume_cpus); 1400 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org