[linux-next:master 10691/14813] drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32

[linux-next:master 10691/14813] drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32

[kernel test robot]

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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/commit/?id=b5b5b32081cd206baa6e58cca7f112d9723785d6
        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@intel.com>


"sparse warnings: (new ones prefixed by >>)"
>> drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32
>> drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32
>> drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32
>> drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32
>> drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32
>> drivers/i2c/busses/i2c-mlxbf.c:513:21: sparse: sparse: cast to restricted __be32
>> drivers/i2c/busses/i2c-mlxbf.c:527:35: sparse: sparse: cast from restricted __be32

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	{
 > 513		return (u32)be32_to_cpu(mlxbf_i2c_read(io, reg));
   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	{
 > 527		mlxbf_i2c_write(io, reg, (u32)cpu_to_be32(val));
   528	}
   529	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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