tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: ff90dfd2579b2c7bc1f0baa0cb99c918c6c1ec64 commit: 279dcf693ac76c9d16b91ffc41280babaff26bb2 [9088/11791] virt: acrn: Introduce an interface for Service VM to control vCPU config: x86_64-randconfig-r031-20210218 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 279dcf693ac76c9d16b91ffc41280babaff26bb2 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/virt/acrn/hsm.c: In function 'remove_cpu_store': 389 | remove_cpu(cpu); | ^~~~~~~~~~ 402 | add_cpu(cpu); | ^~~~~~~ cc1: some warnings being treated as errors vim +/remove_cpu +389 drivers/virt/acrn/hsm.c 374 375 static ssize_t remove_cpu_store(struct device *dev, 376 struct device_attribute *attr, 377 const char *buf, size_t count) 378 { 379 u64 cpu, lapicid; 380 int ret; 381 382 if (kstrtoull(buf, 0, &cpu) < 0) 383 return -EINVAL; 384 385 if (cpu >= num_possible_cpus() || cpu == 0 || !cpu_is_hotpluggable(cpu)) 386 return -EINVAL; 387 388 if (cpu_online(cpu)) 390 391 lapicid = cpu_data(cpu).apicid; 392 dev_dbg(dev, "Try to remove cpu %lld with lapicid %lld\n", cpu, lapicid); 393 ret = hcall_sos_remove_cpu(lapicid); 394 if (ret < 0) { 395 dev_err(dev, "Failed to remove cpu %lld!\n", cpu); 396 goto fail_remove; 397 } 398 399 return count; 400 401 fail_remove: 403 return ret; 404 } 405 static DEVICE_ATTR_WO(remove_cpu); 406 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org