Hi David, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on char-misc/char-misc-testing soc/for-next v5.16-rc5] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/David-Brazdil/Driver-for-Open-Pr... base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20211214/202112141150.Hh48OleF-lk...) 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/6fb8e9472d98abcc2dfabd43e95fc4ec5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review David-Brazdil/Driver-for-Open-Profile-for-DICE/20211214-040051 git checkout 6fb8e9472d98abcc2dfabd43e95fc4ec5819ecd0 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/misc/ 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 >>): drivers/misc/open-dice.c: In function 'open_dice_probe': 30 | #define DRIVER_NAME "open-dice" | ^~~~~~~~~~~ drivers/misc/open-dice.c:160:49: note: in expansion of macro 'DRIVER_NAME' 160 | snprintf(drvdata->name, sizeof(drvdata->name), DRIVER_NAME"%d", dev_idx++); | ^~~~~~~~~~~ drivers/misc/open-dice.c:160:62: note: format string is defined here 160 | snprintf(drvdata->name, sizeof(drvdata->name), DRIVER_NAME"%d", dev_idx++); | ~^ | | | int | %ld vim +30 drivers/misc/open-dice.c 29 31 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org