tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/debug head: 0a791a581b083ec45638bbc879f9d5ce568316f6 commit: 3c1a268482238e27b473bfefbd2e27241726110e [11/12] sched/debug: Rename the sched_debug parameter to sched_verbose config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue sched/debug git checkout 3c1a268482238e27b473bfefbd2e27241726110e # save the attached .config to linux build tree make W=1 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 >>): kernel/sched/topology.c: In function 'sched_debug_setup': 17 | sched_debug_verbose = true; | ^~~~~~~~~~~~~~~~~~~ | sched_debug_setup kernel/sched/topology.c:17:2: note: each undeclared identifier is reported only once for each function it appears in kernel/sched/topology.c: In function 'sched_debug': kernel/sched/topology.c:25:9: error: 'sched_debug_verbose' undeclared (first use in this function); did you mean 'sched_debug_setup'? 25 | return sched_debug_verbose; | ^~~~~~~~~~~~~~~~~~~ | sched_debug_setup kernel/sched/topology.c: In function 'sched_domain_debug': kernel/sched/topology.c:134:7: error: 'sched_debug_verbose' undeclared (first use in this function); did you mean 'sched_debug_setup'? 134 | if (!sched_debug_verbose) | ^~~~~~~~~~~~~~~~~~~ | sched_debug_setup kernel/sched/topology.c: In function 'build_sched_domains': kernel/sched/topology.c:2144:12: error: 'sched_debug_verbose' undeclared (first use in this function); did you mean 'sched_debug_setup'? 2144 | if (rq && sched_debug_verbose) { | ^~~~~~~~~~~~~~~~~~~ | sched_debug_setup kernel/sched/topology.c: In function 'sched_debug': kernel/sched/topology.c:26:1: error: control reaches end of non-void function [-Werror=return-type] 26 | } | ^ cc1: some warnings being treated as errors vim +17 kernel/sched/topology.c 14 15 static int __init sched_debug_setup(char *str) 16 { 18 19 return 0; 20 } 21 early_param("sched_verbose", sched_debug_setup); 22 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org