Hi Donglin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on rostedt-trace/for-next v6.1 next-20221213] [cannot apply to rostedt-trace/for-next-urgent] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Donglin-Peng/tracing-probe-add-a-char-type-to-print-the-character-value-of-traced-arguments/20221213-195552 patch link: https://lore.kernel.org/r/20221213115304.3964458-1-dolinux.peng%40gmail.com patch subject: [PATCH] tracing/probe: add a char type to print the character value of traced arguments config: parisc-allyesconfig compiler: hppa-linux-gcc (GCC) 12.1.0 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 # https://github.com/intel-lab-lkp/linux/commit/c09eb24f0c2c27ce649aed5360dcf3299b636de6 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Donglin-Peng/tracing-probe-add-a-char-type-to-print-the-character-value-of-traced-arguments/20221213-195552 git checkout c09eb24f0c2c27ce649aed5360dcf3299b636de6 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash kernel/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from kernel/trace/trace_probe.c:14: >> kernel/trace/trace_probe.h:146:41: warning: no previous prototype for 'print_type_char' [-Wmissing-prototypes] 146 | #define PRINT_TYPE_FUNC_NAME(type) print_type_##type | ^~~~~~~~~~~ kernel/trace/trace_probe.c:34:5: note: in expansion of macro 'PRINT_TYPE_FUNC_NAME' 34 | int PRINT_TYPE_FUNC_NAME(tname)(struct trace_seq *s, void *data, void *ent)\ | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_probe.c:53:1: note: in expansion of macro 'DEFINE_BASIC_PRINT_TYPE_FUNC' 53 | DEFINE_BASIC_PRINT_TYPE_FUNC(char, u8, "%c") | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/print_type_char +146 kernel/trace/trace_probe.h 34fee3a104cea1 Namhyung Kim 2013-11-26 145 b26c74e116ad84 Namhyung Kim 2013-11-26 @146 #define PRINT_TYPE_FUNC_NAME(type) print_type_##type b26c74e116ad84 Namhyung Kim 2013-11-26 147 #define PRINT_TYPE_FMT_NAME(type) print_type_format_##type b26c74e116ad84 Namhyung Kim 2013-11-26 148 -- 0-DAY CI Kernel Test Service https://01.org/lkp