tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 commit: 09f6b27d5ddd9ad0ec096d1b0f8decdacc70f0f8 ARM: dove: multiplatform support date: 1 year, 1 month ago config: arm-buildonly-randconfig-r005-20230515 compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b0fb98227c90adf2536c9ad644a74d5e92961111) 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=09f6b27d5ddd9ad0ec096d1b0f8decdacc70f0f8 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 09f6b27d5ddd9ad0ec096d1b0f8decdacc70f0f8 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/net/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot | Link: https://lore.kernel.org/oe-kbuild-all/202305160749.ay1HAoyP-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from drivers/net/wireless/broadcom/b43/main.c:35: >> drivers/net/wireless/broadcom/b43/b43.h:654:4: warning: field data within 'struct b43_iv' is less aligned than 'union (unnamed union at drivers/net/wireless/broadcom/b43/b43.h:651:2)' and is usually due to 'struct b43_iv' being packed, which can lead to unaligned accesses [-Wunaligned-access] } data __packed; ^ 1 warning generated. vim +654 drivers/net/wireless/broadcom/b43/b43.h e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 645 e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 646 /* Initial Value file format */ e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 647 #define B43_IV_OFFSET_MASK 0x7FFF e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 648 #define B43_IV_32BIT 0x8000 e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 649 struct b43_iv { e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 650 __be16 offset_size; e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 651 union { e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 652 __be16 d16; e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 653 __be32 d32; ba2d3587912f82d drivers/net/wireless/b43/b43.h Eric Dumazet 2010-06-02 @654 } data __packed; ba2d3587912f82d drivers/net/wireless/b43/b43.h Eric Dumazet 2010-06-02 655 } __packed; e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 656 e4d6b7951812d98 drivers/net/wireless/b43/b43.h Michael Buesch 2007-09-18 657 :::::: The code at line 654 was first introduced by commit :::::: ba2d3587912f82d1ab4367975b1df460db60fb1e drivers/net: use __packed annotation :::::: TO: Eric Dumazet :::::: CC: David S. Miller -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests