tree: https://github.com/jimc/linux.git dd-drm-next head: bf8f0832d11f09c546179ca6a2c5432706ea3d32 commit: 221a341c10ebb8545beac6ee3937859d26ddcc60 [3/16] dyndbg: rationalize verbosity config: alpha-allyesconfig (attached as .config) compiler: alpha-linux-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/jimc/linux/commit/221a341c10ebb8545beac6ee3937859d26dd... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dd-drm-next git checkout 221a341c10ebb8545beac6ee3937859d26ddcc60 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 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 >>): In file included from include/linux/printk.h:7, from include/linux/kernel.h:19, from lib/dynamic_debug.c:16: lib/dynamic_debug.c: In function 'ddebug_proc_write': 5 | #define KERN_SOH "\001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/kern_levels.h:14:25: note: in expansion of macro 'KERN_SOH' 14 | #define KERN_INFO KERN_SOH "6" /* informational */ | ^~~~~~~~ include/linux/printk.h:420:16: note: in expansion of macro 'KERN_INFO' 420 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~ lib/dynamic_debug.c:116:17: note: in expansion of macro 'pr_info' 116 | pr_info(fmt, ##__VA_ARGS__); \ | ^~~~~~~ lib/dynamic_debug.c:120:33: note: in expansion of macro 'vnpr_info' 120 | #define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__) | ^~~~~~~~~ lib/dynamic_debug.c:786:9: note: in expansion of macro 'v2pr_info' 786 | v2pr_info("read %u bytes from userspace <\n%s>\n", len, tmpbuf); | ^~~~~~~~~ vim +5 include/linux/kern_levels.h 314ba3520e513a Joe Perches 2012-07-30 4 04d2c8c83d0e3a Joe Perches 2012-07-30 @5 #define KERN_SOH "\001" /* ASCII Start Of Header */ 04d2c8c83d0e3a Joe Perches 2012-07-30 6 #define KERN_SOH_ASCII '\001' 04d2c8c83d0e3a 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