Hi Arkadiusz, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on aba1e4adb54e020d3ca85a4df3ef0f8febe87548] url: https://github.com/0day-ci/linux/commits/Arkadiusz-Kubalewski/Add-basic-S... base: aba1e4adb54e020d3ca85a4df3ef0f8febe87548 config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/615235c3d363d0d6f520b487b655349b5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Arkadiusz-Kubalewski/Add-basic-SyncE-interfaces/20210817-001938 git checkout 615235c3d363d0d6f520b487b655349b56e3d15f # 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 <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): phy_ref_clk.c: In function 'main': 125 | ret = sscanf(argv[2], "%u", &pin); | ~^ ~~~~ | | | | | __u8 * {aka unsigned char *} | unsigned int * | %hhu 132 | ret = sscanf(argv[3], "%u", &enable); | ~^ ~~~~~~~ | | | | | _Bool * | unsigned int * In function 'get_ref_clk', inlined from 'main' at phy_ref_clk.c:130:9: 58 | strncpy(ifdata.ifr_name, ifname, IFNAMSIZ); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org