tree: https://github.com/c-sky/csky-linux linux-5.15-rc1-d1-v4 head: 88c6ea42e010e46e58be159efa07cda22d95a512 commit: 88c6ea42e010e46e58be159efa07cda22d95a512 [7/7] riscv: soc: (not ready) Allwinner D1 GMAC driver config: arc-randconfig-r043-20210904 (attached as .config) compiler: arc-elf-gcc (GCC) 11.2.0 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 # https://github.com/c-sky/csky-linux/commit/88c6ea42e010e46e58be159efa07cda22d95a512 git remote add csky-linux https://github.com/c-sky/csky-linux git fetch --no-tags csky-linux linux-5.15-rc1-d1-v4 git checkout 88c6ea42e010e46e58be159efa07cda22d95a512 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/net/ethernet/allwinnertmp/sunxi-gmac.c:165:6: warning: no previous prototype for 'sunxi_udelay' [-Wmissing-prototypes] 165 | void sunxi_udelay(int n) | ^~~~~~~~~~~~ >> drivers/net/ethernet/allwinnertmp/sunxi-gmac.c:1752:5: warning: no previous prototype for 'geth_set_features' [-Wmissing-prototypes] 1752 | int geth_set_features(struct net_device *ndev, netdev_features_t features) | ^~~~~~~~~~~~~~~~~ -- >> drivers/net/ethernet/allwinnertmp/sunxi-gmac-ops.c:521:6: warning: no previous prototype for 'sunxi_rx_poll' [-Wmissing-prototypes] 521 | void sunxi_rx_poll(void *iobase) | ^~~~~~~~~~~~~ vim +/sunxi_udelay +165 drivers/net/ethernet/allwinnertmp/sunxi-gmac.c 164 > 165 void sunxi_udelay(int n) 166 { 167 udelay(n); 168 } 169 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org