Hi Paulo, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] url: https://github.com/0day-ci/linux/commits/Paulo-Miguel-Almeida/staging-pi4... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git f2c461536226eb0852a241e72b9125685d6741b4 config: arc-randconfig-r043-20220211 (https://download.01.org/0day-ci/archive/20220211/202202111821.UaNmElDF-lk...) compiler: arc-elf-gcc (GCC) 11.2.0 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/0day-ci/linux/commit/a7ea3ecd6bd7905c6ee495a1053108c2b... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Paulo-Miguel-Almeida/staging-pi433-add-rf69_dbg_hex-function/20220211-160900 git checkout a7ea3ecd6bd7905c6ee495a1053108c2bb922ec2 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash drivers/staging/pi433/ 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/staging/pi433/rf69.c: In function 'rf69_dbg_hex': 837 | text_pos = vscnprintf(text, sizeof(textbuf), fmt, args); | ^~~~~~~~ vim +837 drivers/staging/pi433/rf69.c 824 825 static void rf69_dbg_hex(struct spi_device *spi, u8 *buf, unsigned int size, 826 const char *fmt, ...) 827 { 828 va_list args; 829 char textbuf[512] = {}; 830 char *text = textbuf; 831 int text_pos; 832 833 int rowsize = 16; 834 int i, linelen, remaining = size; 835 836 va_start(args, fmt); 838 text += text_pos; 839 va_end(args); 840 841 for (i = 0; i < size; i += rowsize) { 842 linelen = min(remaining, rowsize); 843 remaining -= rowsize; 844 845 hex_dump_to_buffer(buf + i, linelen, rowsize, 1, 846 text, sizeof(textbuf) - text_pos, false); 847 848 dev_dbg(&spi->dev, "%s\n", textbuf); 849 850 memset(text, 0, sizeof(textbuf) - text_pos); 851 } 852 } 853 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org