tree: https://github.com/shenki/linux microwatt-v5.16 head: 8e96c87e7fba5fb249efd40842c26c2bb426d49c commit: 332995960c8d441be0974f27a128b2856139074a [3/9] LiteX: driver for LiteSDCard (litex_mmc) config: riscv-buildonly-randconfig-r003-20211119 (attached as .config) 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 # https://github.com/shenki/linux/commit/332995960c8d441be0974f27a128b28561... git remote add shenki https://github.com/shenki/linux git fetch --no-tags shenki microwatt-v5.16 git checkout 332995960c8d441be0974f27a128b2856139074a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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 >>): void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) { ^ drivers/mmc/host/litex_mmc.c:96:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) { ^ static 1 warning generated. vim +/sdclk_set_clk +96 drivers/mmc/host/litex_mmc.c 94 95 97 u32 div = clk_freq ? host->freq / clk_freq : 256; 98 div = roundup_pow_of_two(div); 99 div = min(max(div, (u32)2), (u32)256); 100 dev_info(&host->dev->dev, 101 "Requested clk_freq=%d: set to %d via div=%d\n", 102 clk_freq, host->freq / div, div); 103 litex_write16(host->sdphy + LITEX_MMC_SDPHY_CLOCKERDIV_OFF, div); 104 } 105 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org