Hi Volodymyr, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 112450df61b7373529b0fe4c122ad13b89d80a8a commit: bb5dbf2cc64d5cfa696765944c784c0010c48ae8 net: marvell: prestera: add firmware v4.0 support date: 3 months ago config: arm-randconfig-r006-20220115 (https://download.01.org/0day-ci/archive/20220115/202201150856.uvqiyjjG-lk...) compiler: arm-linux-gnueabi-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout bb5dbf2cc64d5cfa696765944c784c0010c48ae8 # 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=arm SHELL=/bin/bash drivers/net/ethernet/marvell/prestera/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/net/ethernet/marvell/prestera/prestera_hw.c:284:1: warning: alignment 1 of 'union prestera_msg_port_param' is less than 4 [-Wpacked-not-aligned] 284 | } __packed; | ^ In file included from <command-line>: In function 'prestera_hw_build_tests', inlined from 'prestera_hw_switch_init' at drivers/net/ethernet/marvell/prestera/prestera_hw.c:788:2: 322 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:303:25: note: in definition of macro '__compiletime_assert' 303 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:322:9: note: in expansion of macro '_compiletime_assert' 322 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) | ^~~~~~~~~~~~~~~~ drivers/net/ethernet/marvell/prestera/prestera_hw.c:531:9: note: in expansion of macro 'BUILD_BUG_ON' 531 | BUILD_BUG_ON(sizeof(struct prestera_msg_event_fdb) != 20); | ^~~~~~~~~~~~ vim +/__compiletime_assert_355 +322 include/linux/compiler_types.h eb5c2d4b45e3d2 Will Deacon 2020-07-21 308 eb5c2d4b45e3d2 Will Deacon 2020-07-21 309 #define _compiletime_assert(condition, msg, prefix, suffix) \ eb5c2d4b45e3d2 Will Deacon 2020-07-21 310 __compiletime_assert(condition, msg, prefix, suffix) eb5c2d4b45e3d2 Will Deacon 2020-07-21 311 eb5c2d4b45e3d2 Will Deacon 2020-07-21 312 /** eb5c2d4b45e3d2 Will Deacon 2020-07-21 313 * compiletime_assert - break build and emit msg if condition is false eb5c2d4b45e3d2 Will Deacon 2020-07-21 314 * @condition: a compile-time constant condition to check eb5c2d4b45e3d2 Will Deacon 2020-07-21 315 * @msg: a message to emit if condition is false eb5c2d4b45e3d2 Will Deacon 2020-07-21 316 * eb5c2d4b45e3d2 Will Deacon 2020-07-21 317 * In tradition of POSIX assert, this macro will break the build if the eb5c2d4b45e3d2 Will Deacon 2020-07-21 318 * supplied condition is *false*, emitting the supplied error message if the eb5c2d4b45e3d2 Will Deacon 2020-07-21 319 * compiler has support to do so. eb5c2d4b45e3d2 Will Deacon 2020-07-21 320 */ eb5c2d4b45e3d2 Will Deacon 2020-07-21 321 #define compiletime_assert(condition, msg) \ eb5c2d4b45e3d2 Will Deacon 2020-07-21 @322 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) eb5c2d4b45e3d2 Will Deacon 2020-07-21 323 :::::: The code at line 322 was first introduced by commit :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h :::::: TO: Will Deacon <will(a)kernel.org&gt; :::::: CC: Will Deacon <will(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org