[dhowells-fs:iov-cleanup 14/20] lib/iov_iter.c:208:39: sparse: sparse: incorrect type in argument 1 (different address spaces)

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git iov-cleanup
head:   1293922ed84ec546e199761c4f570d92c21114ea
commit: 587a6a805e2ebf90427af4f9ac35496678d49ca3 [14/20] iov_iter: Convert iterate*() to inline funcs
config: x86_64-randconfig-121-20230921 (https://download.01.org/0day-ci/archive/20230921/202309212239.6vsGPmxF-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230921/202309212239.6vsGPmxF-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/202309212239.6vsGPmxF-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> lib/iov_iter.c:208:39: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *to @@     got void [noderef] __user *iter_to @@
   lib/iov_iter.c:208:39: sparse:     expected void *to
   lib/iov_iter.c:208:39: sparse:     got void [noderef] __user *iter_to
   lib/iov_iter.c: note: in included file (through arch/x86/include/asm/uaccess.h, include/linux/uaccess.h, include/linux/sched/task.h, ...):
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression
   arch/x86/include/asm/uaccess_64.h:88:24: sparse: sparse: cast removes address space '__user' of expression

vim +208 lib/iov_iter.c

   199	
   200	#ifdef CONFIG_ARCH_HAS_COPY_MC
   201	static __always_inline
   202	size_t copy_to_user_iter_mc(void __user *iter_to, size_t progress,
   203				    size_t len, void *from, void *priv2)
   204	{
   205		if (access_ok(iter_to, len)) {
   206			from += progress;
   207			instrument_copy_to_user(iter_to, from, len);
 > 208			len = copy_mc_to_user(iter_to, from, len);
   209		}
   210		return len;
   211	}
   212	

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