[linux-next:master 7033/7280] drivers/mtd/maps/physmap-bt1-rom.c:39:10: warning: cast to smaller integer type 'unsigned int' from 'void

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   95065cb54210eba86bed10cb2118041524d54573
commit: 69a75a1a47d80aaade0c1604d1dcc1f2570515f4 [7033/7280] mtd: physmap: physmap-bt1-rom: Fix __iomem addrspace removal warning
config: arm64-randconfig-r031-20201123 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c8c3a411c50f541ce5362bd60ee3f8fe43ac2722)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=69a75a1a47d80aaade0c1604d1dcc1f2570515f4
        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 69a75a1a47d80aaade0c1604d1dcc1f2570515f4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> drivers/mtd/maps/physmap-bt1-rom.c:39:10: warning: cast to smaller integer type 'unsigned int' from 'void *' [-Wvoid-pointer-to-int-cast]
           shift = (unsigned int)src & 0x3;
                   ^~~~~~~~~~~~~~~~~
   drivers/mtd/maps/physmap-bt1-rom.c:78:10: warning: cast to smaller integer type 'unsigned int' from 'void *' [-Wvoid-pointer-to-int-cast]
           shift = (unsigned int)src & 0x3;
                   ^~~~~~~~~~~~~~~~~
   2 warnings generated.

vim +39 drivers/mtd/maps/physmap-bt1-rom.c

    23	
    24	/*
    25	 * Baikal-T1 SoC ROMs are only accessible by the dword-aligned instructions.
    26	 * We have to take this into account when implementing the data read-methods.
    27	 * Note there is no need in bothering with endianness, since both Baikal-T1
    28	 * CPU and MMIO are LE.
    29	 */
    30	static map_word __xipram bt1_rom_map_read(struct map_info *map,
    31						  unsigned long ofs)
    32	{
    33		void __iomem *src = map->virt + ofs;
    34		unsigned int shift;
    35		map_word ret;
    36		u32 data;
    37	
    38		/* Read data within offset dword. */
  > 39		shift = (unsigned int)src & 0x3;
    40		data = readl_relaxed(src - shift);
    41		if (!shift) {
    42			ret.x[0] = data;
    43			return ret;
    44		}
    45		ret.x[0] = data >> (shift * BITS_PER_BYTE);
    46	
    47		/* Read data from the next dword. */
    48		shift = 4 - shift;
    49		if (ofs + shift >= map->size)
    50			return ret;
    51	
    52		data = readl_relaxed(src + shift);
    53		ret.x[0] |= data << (shift * BITS_PER_BYTE);
    54	
    55		return ret;
    56	}
    57	

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

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