[kbuild-all] net/smc/smc_llc.c:40:1: warning: alignment 1 of 'struct smc_llc_hdr' is less than 4

Hi Karsten, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ee1703cda8dc777e937dec172da55beaf1a74919 commit: b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 net/smc: extend LLC layer for SMC-Rv2 date: 5 weeks ago config: arm-randconfig-c002-20211117 (attached as .config) 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 b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm 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 >>): 40 | } __packed; /* format defined in | ^ In file included from <command-line>: In function 'smc_llc_add_pending_send', inlined from 'smc_llc_send_test_link' at net/smc/smc_llc.c:736:7, inlined from 'smc_llc_testlink_work' at net/smc/smc_llc.c:2094:2: include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_576' declared with attribute error: must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg) 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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:409:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 409 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_577' declared with attribute error: must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send() 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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:412:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 412 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ In function 'smc_llc_add_pending_send', inlined from 'smc_llc_send_message' at net/smc/smc_llc.c:760:7: include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_576' declared with attribute error: must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg) 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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:409:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 409 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_577' declared with attribute error: must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send() 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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:412:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 412 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ In function 'smc_llc_add_pending_send', inlined from 'smc_llc_send_confirm_rkey' at net/smc/smc_llc.c:492:7: include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_576' declared with attribute error: must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg) 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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:409:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 409 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_577' declared with attribute error: must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send() 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) | ^~~~~~~~~~~~~~~~~~ net/smc/smc_llc.c:412:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 412 | BUILD_BUG_ON_MSG( | ^~~~~~~~~~~~~~~~ vim +40 net/smc/smc_llc.c 23 24 struct smc_llc_hdr { 25 struct smc_wr_rx_hdr common; 26 union { 27 struct { 28 u8 length; /* 44 */ 29 #if defined(__BIG_ENDIAN_BITFIELD) 30 u8 reserved:4, 31 add_link_rej_rsn:4; 32 #elif defined(__LITTLE_ENDIAN_BITFIELD) 33 u8 add_link_rej_rsn:4, 34 reserved:4; 35 #endif 36 }; 37 u16 length_v2; /* 44 - 8192*/ 38 }; 39 u8 flags; 41 * IBM Shared Memory Communications Version 2 42 * (https://www.ibm.com/support/pages/node/6326337) 43 */ 44 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org