tree: https://github.com/jpirko/linux_mlxsw petrm_soft_counters head: 38ca0aa04554a994a5ab769f0c07b37484b5f4c9 commit: 0839ffb5b56fb6f5e67545c77bf6151fe606835d [9/10] wip config: arc-randconfig-r043-20211210 (https://download.01.org/0day-ci/archive/20211210/202112101613.n18YqogN-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/jpirko/linux_mlxsw/commit/0839ffb5b56fb6f5e67545c77bf6... git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw git fetch --no-tags jpirko-mlxsw petrm_soft_counters git checkout 0839ffb5b56fb6f5e67545c77bf6151fe606835d # 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 net/core/ 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 >>): In file included from include/linux/kernel.h:19, from include/linux/list.h:9, from include/linux/module.h:12, from net/core/rtnetlink.c:17: net/core/rtnetlink.c: In function 'if_nlmsg_stats_size': 5 | #define KERN_SOH "\001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/printk.h:418:25: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~ net/core/rtnetlink.c:5509:9: note: in expansion of macro 'printk' 5509 | printk(KERN_WARNING "if_nlmsg_stats_size %ld\n", size); | ^~~~~~ include/linux/kern_levels.h:12:25: note: in expansion of macro 'KERN_SOH' 12 | #define KERN_WARNING KERN_SOH "4" /* warning conditions */ | ^~~~~~~~ net/core/rtnetlink.c:5509:16: note: in expansion of macro 'KERN_WARNING' 5509 | printk(KERN_WARNING "if_nlmsg_stats_size %ld\n", size); | ^~~~~~~~~~~~ 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 :::::: The code at line 5 was first introduced by commit :::::: 04d2c8c83d0e3ac5f78aeede51babb3236200112 printk: convert the format for KERN_<LEVEL> to a 2 byte pattern :::::: TO: Joe Perches <joe(a)perches.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org