tree: git://github.com/kvm-riscv/linux.git riscv_kvm_master head: 36e7b3ba5f5456ef4f2d7989b06c4f1fea368e6f commit: 0d79f1ca8d6a481003a90a439c4281acecbc79c1 [15/21] RISC-V: KVM: Add timer functionality config: riscv-randconfig-r005-20200710 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) 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 git checkout 0d79f1ca8d6a481003a90a439c4281acecbc79c1 # 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 >>): void riscv_cs_get_mult_shift(u32 *mult, u32 *shift) ^ drivers/clocksource/timer-riscv.c:96:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void riscv_cs_get_mult_shift(u32 *mult, u32 *shift) ^ static 1 warning generated. vim +/riscv_cs_get_mult_shift +96 drivers/clocksource/timer-riscv.c 95 97 { 98 *mult = riscv_clocksource.mult; 99 *shift = riscv_clocksource.shift; 100 } 101 EXPORT_SYMBOL_GPL(riscv_cs_get_mult_shift); 102 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org