tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4 head: 675b5726e8452a03e2cf91f66e813716edf4c2aa commit: 1b2c0f4d0c562e21b694ea2284ac6928b433f375 [76/110] CHROMIUM: mmc: sdhci-pci: Prefer SDR25 timing for High Speed mode for BYT-based Intel controllers config: x86_64-randconfig-a015-20201109 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 09ec07827b1128504457a93dee80b2ceee1af600) 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 git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.4 git checkout 1b2c0f4d0c562e21b694ea2284ac6928b433f375 # 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 >>): void sdhci_intel_set_uhs_signaling(struct sdhci_host *host, unsigned timing) ^ drivers/mmc/host/sdhci-pci-core.c:668:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sdhci_intel_set_uhs_signaling(struct sdhci_host *host, unsigned timing) ^ static 1 warning generated. vim +/sdhci_intel_set_uhs_signaling +668 drivers/mmc/host/sdhci-pci-core.c 667 669 { 670 /* Set UHS timing to SDR25 for High Speed mode */ 671 if (timing == MMC_TIMING_MMC_HS || timing == MMC_TIMING_SD_HS) 672 timing = MMC_TIMING_UHS_SDR25; 673 sdhci_set_uhs_signaling(host, timing); 674 } 675 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org