tree: https://github.com/stffrdhrn/linux.git or1k-5.15-litex-sdcard head: 9802d0ed2e47ab8b2c6c3e82c4f41591ec11f958 commit: 9802d0ed2e47ab8b2c6c3e82c4f41591ec11f958 [1/1] LiteX: driver for LiteSDCard (litex_mmc) config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/stffrdhrn/linux/commit/9802d0ed2e47ab8b2c6c3e82c4f41591ec11f958 git remote add stffrdhrn https://github.com/stffrdhrn/linux.git git fetch --no-tags stffrdhrn or1k-5.15-litex-sdcard git checkout 9802d0ed2e47ab8b2c6c3e82c4f41591ec11f958 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/mmc/host/litex_mmc.c:96:6: warning: no previous prototype for 'sdclk_set_clk' [-Wmissing-prototypes] 96 | void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) { | ^~~~~~~~~~~~~ vim +/sdclk_set_clk +96 drivers/mmc/host/litex_mmc.c 94 95 > 96 void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) { 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