tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: dfd71d381f7e1aa118e0368774aa05f5c4a48870 commit: 14da1510fedc2d72ca81344a0f62939e0a1bc648 [5057/6402] Revert "net: bcmgenet: remove unused function in bcmgenet.c" config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) reproduce: 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 git checkout 14da1510fedc2d72ca81344a0f62939e0a1bc648 # 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: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): int bcmgenet_hfb_add_filter(struct bcmgenet_priv *priv, u32 *f_data, ^ drivers/net/ethernet/broadcom/genet/bcmgenet.c:2858:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int bcmgenet_hfb_add_filter(struct bcmgenet_priv *priv, u32 *f_data, ^ static drivers/net/ethernet/broadcom/genet/bcmgenet.c:120:26: warning: unused function 'dmadesc_get_addr' [-Wunused-function] static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv, ^ 2 warnings generated. vim +/bcmgenet_hfb_add_filter +2858 drivers/net/ethernet/broadcom/genet/bcmgenet.c 2822 2823 /* bcmgenet_hfb_add_filter 2824 * 2825 * Add new filter to Hardware Filter Block to match and direct Rx traffic to 2826 * desired Rx queue. 2827 * 2828 * f_data is an array of unsigned 32-bit integers where each 32-bit integer 2829 * provides filter data for 2 bytes (4 nibbles) of Rx frame: 2830 * 2831 * bits 31:20 - unused 2832 * bit 19 - nibble 0 match enable 2833 * bit 18 - nibble 1 match enable 2834 * bit 17 - nibble 2 match enable 2835 * bit 16 - nibble 3 match enable 2836 * bits 15:12 - nibble 0 data 2837 * bits 11:8 - nibble 1 data 2838 * bits 7:4 - nibble 2 data 2839 * bits 3:0 - nibble 3 data 2840 * 2841 * Example: 2842 * In order to match: 2843 * - Ethernet frame type = 0x0800 (IP) 2844 * - IP version field = 4 2845 * - IP protocol field = 0x11 (UDP) 2846 * 2847 * The following filter is needed: 2848 * u32 hfb_filter_ipv4_udp[] = { 2849 * Rx frame offset 0x00: 0x00000000, 0x00000000, 0x00000000, 0x00000000, 2850 * Rx frame offset 0x08: 0x00000000, 0x00000000, 0x000F0800, 0x00084000, 2851 * Rx frame offset 0x10: 0x00000000, 0x00000000, 0x00000000, 0x00030011, 2852 * }; 2853 * 2854 * To add the filter to HFB and direct the traffic to Rx queue 0, call: 2855 * bcmgenet_hfb_add_filter(priv, hfb_filter_ipv4_udp, 2856 * ARRAY_SIZE(hfb_filter_ipv4_udp), 0); 2857 */ 2859 u32 f_length, u32 rx_queue) 2860 { 2861 int f_index; 2862 u32 i; 2863 2864 f_index = bcmgenet_hfb_find_unused_filter(priv); 2865 if (f_index < 0) 2866 return -ENOMEM; 2867 2868 if (f_length > priv->hw_params->hfb_filter_size) 2869 return -EINVAL; 2870 2871 for (i = 0; i < f_length; i++) 2872 bcmgenet_hfb_writel(priv, f_data[i], 2873 (f_index * priv->hw_params->hfb_filter_size + i) * 2874 sizeof(u32)); 2875 2876 bcmgenet_hfb_set_filter_length(priv, f_index, 2 * f_length); 2877 bcmgenet_hfb_set_filter_rx_queue_mapping(priv, f_index, rx_queue); 2878 bcmgenet_hfb_enable_filter(priv, f_index); 2879 bcmgenet_hfb_reg_writel(priv, 0x1, HFB_CTRL); 2880 2881 return 0; 2882 } 2883 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org