[isilence:zctx/devmem 14/15] io_uring/rsrc.c:1227:36: sparse: sparse: incorrect type in argument 3 (different address spaces)

[isilence:zctx/devmem 14/15] io_uring/rsrc.c:1227:36: sparse: sparse: incorrect type in argument 3 (different address spaces)

[kernel test robot]

tree:   https://github.com/isilence/linux zctx/devmem
head:   ad3d2185448cf828c65336fa4b71233098473a4a
commit: cd188445aee6477a09e0908f090106517becc7c0 [14/15] io_uring/rsrc: add zcrx backed registered buffers
config: arc-randconfig-r122-20260708 (https://download.01.org/0day-ci/archive/20260708/202607080831.vyhUT1Ca-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260708/202607080831.vyhUT1Ca-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/202607080831.vyhUT1Ca-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> io_uring/rsrc.c:1227:36: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void [noderef] __user *buf @@     got void * @@
   io_uring/rsrc.c:1227:36: sparse:     expected void [noderef] __user *buf
   io_uring/rsrc.c:1227:36: sparse:     got void *
   io_uring/rsrc.c: note: in included file:
   io_uring/filetable.h:55:35: sparse: sparse: restricted io_req_flags_t degrades to integer
   io_uring/filetable.h:55:35: sparse: sparse: restricted io_req_flags_t degrades to integer

vim +1227 io_uring/rsrc.c

  1222	
  1223	static int io_import_from_zcrx(int ddir, struct iov_iter *iter,
  1224					struct io_mapped_ubuf *imu,
  1225					u64 buf_addr, size_t len)
  1226	{
> 1227		iov_iter_ubuf(iter, ddir, (void *)(unsigned long)buf_addr, len);
  1228		return 0;
  1229	}
  1230	

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