linux-kernel - drivers/net/can/spi/mcp251xfd/mcp251xfd.h:481:34: warning: field hw_tx_obj within 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:479:2)' is less aligned than 'struct mcp251xfd_hw_tx_obj

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Message-ID: <202205181414.n8QRDe8k-lkp@intel.com>
Date:   Wed, 18 May 2022 14:45:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: drivers/net/can/spi/mcp251xfd/mcp251xfd.h:481:34: warning: field
 hw_tx_obj within 'struct mcp251xfd_tx_obj_load_buf::(unnamed at
 drivers/net/can/spi/mcp251xfd/mcp251xfd.h:479:2)' is less aligned than
 'struct mcp251xfd_hw_tx_obj_raw' and is usually due to ...

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   210e04ff768142b96452030c4c2627512b30ad95
commit: eb79a267c9b3e608e7762a1b221428f37ace3aa3 can: mcp251xfd: rename all remaining occurrence to mcp251xfd
date:   1 year, 8 months ago
config: arm-randconfig-c002-20220518 (https://download.01.org/0day-ci/archive/20220518/202205181414.n8QRDe8k-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 853fa8ee225edf2d0de94b0dcbd31bea916e825e)
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=eb79a267c9b3e608e7762a1b221428f37ace3aa3
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout eb79a267c9b3e608e7762a1b221428f37ace3aa3
        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/net/can/spi/mcp251xfd/mcp251xfd.h:481:34: warning: field hw_tx_obj within 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:479:2)' is less aligned than 'struct mcp251xfd_hw_tx_obj_raw' and is usually due to 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:479:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access]
                   struct mcp251xfd_hw_tx_obj_raw hw_tx_obj;
                                                  ^
   drivers/net/can/spi/mcp251xfd/mcp251xfd.h:485:34: warning: field hw_tx_obj within 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:483:2)' is less aligned than 'struct mcp251xfd_hw_tx_obj_raw' and is usually due to 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:483:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access]
                   struct mcp251xfd_hw_tx_obj_raw hw_tx_obj;
                                                  ^
   drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c:511:1: warning: unused function 'mcp251xfd_chip_set_mode_nowait' [-Wunused-function]
   mcp251xfd_chip_set_mode_nowait(const struct mcp251xfd_priv *priv,
   ^
   3 warnings generated.
--
>> drivers/net/can/spi/mcp251xfd/mcp251xfd.h:481:34: warning: field hw_tx_obj within 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:479:2)' is less aligned than 'struct mcp251xfd_hw_tx_obj_raw' and is usually due to 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:479:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access]
                   struct mcp251xfd_hw_tx_obj_raw hw_tx_obj;
                                                  ^
   drivers/net/can/spi/mcp251xfd/mcp251xfd.h:485:34: warning: field hw_tx_obj within 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:483:2)' is less aligned than 'struct mcp251xfd_hw_tx_obj_raw' and is usually due to 'struct mcp251xfd_tx_obj_load_buf::(unnamed at drivers/net/can/spi/mcp251xfd/mcp251xfd.h:483:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access]
                   struct mcp251xfd_hw_tx_obj_raw hw_tx_obj;
                                                  ^
   2 warnings generated.


vim +481 drivers/net/can/spi/mcp251xfd/mcp251xfd.h

   477	
   478	union mcp251xfd_tx_obj_load_buf {
   479		struct __packed {
   480			struct mcp251xfd_buf_cmd cmd;
 > 481			struct mcp251xfd_hw_tx_obj_raw hw_tx_obj;
   482		} nocrc;
   483		struct __packed {
   484			struct mcp251xfd_buf_cmd_crc cmd;
   485			struct mcp251xfd_hw_tx_obj_raw hw_tx_obj;
   486			__be16 crc;
   487		} crc;
   488	} ____cacheline_aligned;
   489	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp