[linux-next:master 9546/11394] drivers/mtd/ubi/nvmem.c:34:16: sparse: sparse: incompatible types in comparison expression (different type sizes):

[linux-next:master 9546/11394] drivers/mtd/ubi/nvmem.c:34:16: sparse: sparse: incompatible types in comparison expression (different type sizes):

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   1870cdc0e8dee32e3c221704a2977898ba4c10e8
commit: 3ce485803da1b79b2692b6d0c2792829292ad838 [9546/11394] mtd: ubi: provide NVMEM layer over UBI volumes
config: mips-randconfig-r113-20240302 (https://download.01.org/0day-ci/archive/20240302/202403020803.FQFeCxpT-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 325f51237252e6dab8e4e1ea1fa7acbb4faee1cd)
reproduce: (https://download.01.org/0day-ci/archive/20240302/202403020803.FQFeCxpT-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403020803.FQFeCxpT-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mtd/ubi/nvmem.c:34:16: sparse: sparse: incompatible types in comparison expression (different type sizes):
   drivers/mtd/ubi/nvmem.c:34:16: sparse:    int *
   drivers/mtd/ubi/nvmem.c:34:16: sparse:    unsigned long long [usertype] *
   drivers/mtd/ubi/nvmem.c:34:16: sparse: sparse: shift too big (32) for type int
   drivers/mtd/ubi/nvmem.c: note: in included file (through drivers/mtd/ubi/ubi.h):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +34 drivers/mtd/ubi/nvmem.c

    22	
    23	static int ubi_nvmem_reg_read(void *priv, unsigned int from,
    24				      void *val, size_t bytes)
    25	{
    26		int err = 0, lnum = from, offs, bytes_left = bytes, to_read;
    27		struct ubi_nvmem *unv = priv;
    28		struct ubi_volume_desc *desc;
    29	
    30		desc = ubi_open_volume(unv->ubi_num, unv->vol_id, UBI_READONLY);
    31		if (IS_ERR(desc))
    32			return PTR_ERR(desc);
    33	
  > 34		offs = do_div(lnum, unv->usable_leb_size);
    35		while (bytes_left) {
    36			to_read = unv->usable_leb_size - offs;
    37	
    38			if (to_read > bytes_left)
    39				to_read = bytes_left;
    40	
    41			err = ubi_read(desc, lnum, val, offs, to_read);
    42			if (err)
    43				break;
    44	
    45			lnum += 1;
    46			offs = 0;
    47			bytes_left -= to_read;
    48			val += to_read;
    49		}
    50		ubi_close_volume(desc);
    51	
    52		if (err)
    53			return err;
    54	
    55		return bytes_left == 0 ? 0 : -EIO;
    56	}
    57	

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