tree: https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next head: 5cc38fa6fc7448d40ff214d5c087f508355e8446 commit: 6e3cfcf6ea031fe2a0068fa7c380c4cf7bcd8936 [2/11] riscv: use vDSO common flow to reduce the latency of the time-related functions config: riscv-randconfig-r022-20200607 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project bc2b70982be8f5250cd0082a7190f8b417bd4dfe) 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 6e3cfcf6ea031fe2a0068fa7c380c4cf7bcd8936 # 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 >>, old ones prefixed by <<): int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) ^ arch/riscv/kernel/vdso/vgettimeofday.c:12:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) ^ static int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) ^ arch/riscv/kernel/vdso/vgettimeofday.c:17:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) ^ static int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res) ^ arch/riscv/kernel/vdso/vgettimeofday.c:22:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res) ^ static 3 warnings generated. vim +/__vdso_clock_gettime +12 arch/riscv/kernel/vdso/vgettimeofday.c 11 13 { 14 return __cvdso_clock_gettime(clock, ts); 15 } 16 18 { 19 return __cvdso_gettimeofday(tv, tz); 20 } 21 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org