tree: https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features head: 80f06306240e0ad1c75116111be11950474dfda7 commit: 80f06306240e0ad1c75116111be11950474dfda7 [42/42] s390/vdso: reimplement getcpu vdso syscall config: s390-randconfig-r035-20201123 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c8c3a411c50f541ce5362bd60ee3f8fe43ac2722) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?id=80f06306240e0ad1c75116111be11950474dfda7 git remote add s390 https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git git fetch --no-tags s390 features git checkout 80f06306240e0ad1c75116111be11950474dfda7 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/s390/kernel/vdso64/getcpu.c:8:5: warning: no previous prototype for function '__s390_vdso_getcpu' [-Wmissing-prototypes] int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) ^ arch/s390/kernel/vdso64/getcpu.c:8:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) ^ static 1 warning generated. vim +/__s390_vdso_getcpu +8 arch/s390/kernel/vdso64/getcpu.c 7 > 8 int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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