tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 148fdf990dee4efd23c1114811b205de9c966680 commit: b5b5b32081cd206baa6e58cca7f112d9723785d6 [10691/14813] i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC config: arm64-randconfig-s031-20201012 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-rc1-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout b5b5b32081cd206baa6e58cca7f112d9723785d6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" vim +513 drivers/i2c/busses/i2c-mlxbf.c 501 502 /* 503 * This function is used to read data from Master GW Data Descriptor. 504 * Data bytes in the Master GW Data Descriptor are shifted left so the 505 * data starts at the MSB of the descriptor registers as set by the 506 * underlying hardware. TYU_READ_DATA enables byte swapping while 507 * reading data bytes, and MUST be called by the SMBus read routines 508 * to copy data from the 32 * 32-bit HW Data registers a.k.a Master GW 509 * Data Descriptor. 510 */ 511 static u32 mlxbf_i2c_read_data(void __iomem *io, int reg) 512 { 514 } 515 516 /* 517 * This function is used to write data to the Master GW Data Descriptor. 518 * Data copied to the Master GW Data Descriptor MUST be shifted left so 519 * the data starts at the MSB of the descriptor registers as required by 520 * the underlying hardware. TYU_WRITE_DATA enables byte swapping when 521 * writing data bytes, and MUST be called by the SMBus write routines to 522 * copy data to the 32 * 32-bit HW Data registers a.k.a Master GW Data 523 * Descriptor. 524 */ 525 static void mlxbf_i2c_write_data(void __iomem *io, int reg, u32 val) 526 { 528 } 529 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org