Hi Vaishnav, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on linux/master robh/for-next soc/for-next linus/master v5.9-rc1 next-20200818] [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/Vaishnav-M-A/mikroBUS-driver-for... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 config: alpha-allyesconfig (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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/mikrobus/mikrobus_manifest.c: In function 'mikrobus_manifest_parse_devices': drivers/misc/mikrobus/mikrobus_manifest.c:363:6: warning: variable 'retval' set but not used [-Wunused-but-set-variable] 363 | int retval; | ^~~~~~ In file included from include/linux/printk.h:7, from include/linux/kernel.h:15, from drivers/misc/mikrobus/mikrobus_core.h:12, from drivers/misc/mikrobus/mikrobus_manifest.h:15, from drivers/misc/mikrobus/mikrobus_manifest.c:18: drivers/misc/mikrobus/mikrobus_manifest.c: In function 'mikrobus_manifest_parse': 5 | #define KERN_SOH "\001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH' 11 | #define KERN_ERR KERN_SOH "3" /* error conditions */ | ^~~~~~~~ include/linux/printk.h:339:9: note: in expansion of macro 'KERN_ERR' 339 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~ drivers/misc/mikrobus/mikrobus_manifest.c:396:3: note: in expansion of macro 'pr_err' 396 | pr_err("invalid manifest size(%zu < %zu)", size, manifest_size); | ^~~~~~ drivers/misc/mikrobus/mikrobus_manifest.c:396:41: note: format string is defined here 396 | pr_err("invalid manifest size(%zu < %zu)", size, manifest_size); | ~~^ | | | long unsigned int | %u In file included from include/linux/printk.h:7, from include/linux/kernel.h:15, from drivers/misc/mikrobus/mikrobus_core.h:12, from drivers/misc/mikrobus/mikrobus_manifest.h:15, from drivers/misc/mikrobus/mikrobus_manifest.c:18: include/linux/kern_levels.h:5:18: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'int' [-Wformat=] 5 | #define KERN_SOH "\001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH' 11 | #define KERN_ERR KERN_SOH "3" /* error conditions */ | ^~~~~~~~ include/linux/printk.h:339:9: note: in expansion of macro 'KERN_ERR' 339 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~ drivers/misc/mikrobus/mikrobus_manifest.c:412:4: note: in expansion of macro 'pr_err' 412 | pr_err("invalid manifest descriptor, size: %zu", desc_size); | ^~~~~~ drivers/misc/mikrobus/mikrobus_manifest.c:412:49: note: format string is defined here 412 | pr_err("invalid manifest descriptor, size: %zu", desc_size); | ~~^ | | | long unsigned int | %u # https://github.com/0day-ci/linux/commit/c988bea7af28a40a4c0a835b6765a2c4f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Vaishnav-M-A/mikroBUS-driver-for-add-on-boards/20200818-205058 git checkout c988bea7af28a40a4c0a835b6765a2c4fe154c04 vim +5 include/linux/kern_levels.h 314ba3520e513a7 Joe Perches 2012-07-30 4 04d2c8c83d0e3ac Joe Perches 2012-07-30 @5 #define KERN_SOH "\001" /* ASCII Start Of Header */ 04d2c8c83d0e3ac Joe Perches 2012-07-30 6 #define KERN_SOH_ASCII '\001' 04d2c8c83d0e3ac Joe Perches 2012-07-30 7 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org