tree: https://github.com/Freescale/linux-fslc 5.4-2.3.x-imx head: a8a2b9ee4bec0b29d031324160b7f11af42a563a commit: 44980ad6bb897f146cdf6e8133b20e99eaa4db91 [6973/16543] MLK-23251-01: net: stmac: tsn: add tc mqprio support config: x86_64-randconfig-a004-20210114 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 6077d55381a6aa3e947ef7abdc36a7515c598c8a) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/Freescale/linux-fslc/commit/44980ad6bb897f146cdf6e8133... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc 5.4-2.3.x-imx git checkout 44980ad6bb897f146cdf6e8133b20e99eaa4db91 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): int stmmactc_setup_mqprio(struct net_device *ndev, void *type_data) ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:4112:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int stmmactc_setup_mqprio(struct net_device *ndev, void *type_data) ^ static drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:3442:19: warning: unused function 'stmmac_rx_threshold_count' [-Wunused-function] static inline int stmmac_rx_threshold_count(struct stmmac_rx_queue *rx_q) ^ 2 warnings generated. vim +/stmmactc_setup_mqprio +4112 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c 4111 4113 { 4114 struct tc_mqprio_qopt *mqprio = type_data; 4115 u8 num_tc; 4116 int i; 4117 4118 num_tc = mqprio->num_tc; 4119 netif_set_real_num_tx_queues(ndev, num_tc); 4120 netdev_set_num_tc(ndev, num_tc); 4121 for (i = 0; i < num_tc; i++) 4122 netdev_set_tc_queue(ndev, i, 1, i); 4123 4124 return 0; 4125 } 4126 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org