Messages in this thread | | | Date | Sat, 25 Jun 2022 10:43:58 +0800 | From | kernel test robot <> | Subject | net/smc/smc_llc.c:26:2: warning: field within 'struct smc_llc_hdr' is less aligned than 'union smc_llc_hdr::(anonymous at net/smc/smc_llc.c:26:2)' and is usually due to 'struct smc_llc_hdr' being packed, which can lead to unaligned accesses |
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Hi Karsten,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 92f20ff72066d8d7e2ffb655c2236259ac9d1c5d commit: b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 net/smc: extend LLC layer for SMC-Rv2 date: 8 months ago config: arm-randconfig-c002-20220622 (https://download.01.org/0day-ci/archive/20220624/202206240723.OOu0nUgA-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project af6d2a0b6825e71965f3e2701a63c239fa0ad70f) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 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 config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash net/
If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> net/smc/smc_llc.c:26:2: warning: field within 'struct smc_llc_hdr' is less aligned than 'union smc_llc_hdr::(anonymous at net/smc/smc_llc.c:26:2)' and is usually due to 'struct smc_llc_hdr' being packed, which can lead to unaligned accesses [-Wunaligned-access] union { ^ 1 warning generated.
vim +26 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; 40 } __packed; /* format defined in 41 * IBM Shared Memory Communications Version 2 42 * (https://www.ibm.com/support/pages/node/6326337) 43 */ 44
-- 0-DAY CI Kernel Test Service https://01.org/lkp
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