tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.12.y-rt-rebase head: ae0700ef2de03e51d49515f06447c1318a4f0843 commit: 13357aa7f9e394ed60d2c424fb94671dc448bd44 [130/191] rcu: Delay RCU-selftests config: riscv-randconfig-r035-20210312 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 7b153b43d3a14d76975039408c4b922beb576735) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/com... git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git git fetch --no-tags linux-rt-devel linux-5.12.y-rt-rebase git checkout 13357aa7f9e394ed60d2c424fb94671dc448bd44 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from kernel/rcu/update.c:580: void rcu_tasks_initiate_self_tests(void) ^ kernel/rcu/tasks.h:1262:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void rcu_tasks_initiate_self_tests(void) ^ static 1 warning generated. vim +/rcu_tasks_initiate_self_tests +1262 kernel/rcu/tasks.h 1261 1263 { 1264 pr_info("Running RCU-tasks wait API self tests\n"); 1265 #ifdef CONFIG_TASKS_RCU 1266 synchronize_rcu_tasks(); 1267 call_rcu_tasks(&tests[0].rh, test_rcu_tasks_callback); 1268 #endif 1269 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org