[yiliu1765-iommufd:wip/iommufd-v6.2-rc4-nesting 19/43] drivers/iommu/iommufd/device.c:140:21: sparse: sparse: non size-preserving integer to pointer cast

[yiliu1765-iommufd:wip/iommufd-v6.2-rc4-nesting 19/43] drivers/iommu/iommufd/device.c:140:21: sparse: sparse: non size-preserving integer to pointer cast

[kernel test robot]

tree:   https://github.com/yiliu1765/iommufd.git wip/iommufd-v6.2-rc4-nesting
head:   88fc43f83ab9bb5590e8f8f974e6b2958bf9b65d
commit: 780ff179e3d77515319b240ba246a691d9365477 [19/43] iommufd: Add IOMMU_DEVICE_GET_INFO
config: csky-randconfig-s041-20230122 (https://download.01.org/0day-ci/archive/20230122/202301221445.kamShCvg-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://github.com/yiliu1765/iommufd/commit/780ff179e3d77515319b240ba246a691d9365477
        git remote add yiliu1765-iommufd https://github.com/yiliu1765/iommufd.git
        git fetch --no-tags yiliu1765-iommufd wip/iommufd-v6.2-rc4-nesting
        git checkout 780ff179e3d77515319b240ba246a691d9365477
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=csky olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=csky SHELL=/bin/bash drivers/iommu/iommufd/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

sparse warnings: (new ones prefixed by >>)
   drivers/iommu/iommufd/device.c: note: in included file (through include/linux/uaccess.h, include/linux/sched/task.h, include/linux/sched/signal.h, ...):
   arch/csky/include/asm/uaccess.h:110:17: sparse: sparse: cast removes address space '__user' of expression
   arch/csky/include/asm/uaccess.h:110:17: sparse: sparse: asm output is not an lvalue
   arch/csky/include/asm/uaccess.h:110:17: sparse: sparse: cast removes address space '__user' of expression
>> drivers/iommu/iommufd/device.c:140:21: sparse: sparse: non size-preserving integer to pointer cast
   arch/csky/include/asm/uaccess.h:110:17: sparse: sparse: generating address of non-lvalue (11)

vim +140 drivers/iommu/iommufd/device.c

   134	
   135	static int iommufd_zero_fill_user(u64 ptr, int bytes)
   136	{
   137		int index = 0;
   138	
   139		for (; index < bytes; index++) {
 > 140			if (put_user(0, (uint8_t __user *)(ptr + index)))
   141				return -EFAULT;
   142		}
   143		return 0;
   144	}
   145	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests