tree: git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git for-kernelci head: 295a2a7d5fd9ff0e1fd50d5265297464888cbfef commit: 295a2a7d5fd9ff0e1fd50d5265297464888cbfef [4/4] efi: use 32-bit alignment for efi_guid_t literals config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-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 # https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id... git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git git fetch --no-tags ardb for-kernelci git checkout 295a2a7d5fd9ff0e1fd50d5265297464888cbfef # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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:16, from include/linux/list.h:9, from include/linux/module.h:12, from security/integrity/platform_certs/efi_parser.c:9: security/integrity/platform_certs/efi_parser.c: In function 'parse_efi_signature_list': 5 | #define KERN_SOH "\001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/printk.h:140:10: note: in definition of macro 'no_printk' 140 | printk(fmt, ##__VA_ARGS__); \ | ^~~ include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH' 15 | #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */ | ^~~~~~~~ include/linux/printk.h:402:12: note: in expansion of macro 'KERN_DEBUG' 402 | no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~ security/integrity/platform_certs/efi_parser.c:56:3: note: in expansion of macro 'pr_devel' 56 | pr_devel("LIST[%04x] guid=%pUl ls=%x hs=%x ss=%x\n", | ^~~~~~~~ security/integrity/platform_certs/efi_parser.c:56:30: note: format string is defined here 56 | pr_devel("LIST[%04x] guid=%pUl ls=%x hs=%x ss=%x\n", | ~^ | | | void * | %d 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