Re: [PATCH v4 07/10] dm: Add support for copy offload.

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

Hi Nitesh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20220422]
[cannot apply to axboe-block/for-next device-mapper-dm/for-next linus/master v5.18-rc4 v5.18-rc3 v5.18-rc2 v5.18-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Nitesh-Shetty/block-Introduce-queue-limits-for-copy-offload-support/20220426-201825
base:    e7d6987e09a328d4a949701db40ef63fbb970670
config: s390-randconfig-s032-20220427 (https://download.01.org/0day-ci/archive/20220428/202204282336.7AY0GVKz-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
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-dirty
        # https://github.com/intel-lab-lkp/linux/commit/913c8c5197fea28ee3c8424e16eadd8b159a91f0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nitesh-Shetty/block-Introduce-queue-limits-for-copy-offload-support/20220426-201825
        git checkout 913c8c5197fea28ee3c8424e16eadd8b159a91f0
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash drivers/md/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/md/dm.c:1602:24: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted blk_status_t @@     got int @@
   drivers/md/dm.c:1602:24: sparse:     expected restricted blk_status_t
   drivers/md/dm.c:1602:24: sparse:     got int

vim +1602 drivers/md/dm.c

  1582	
  1583	/*
  1584	 * Select the correct strategy for processing a non-flush bio.
  1585	 */
  1586	static blk_status_t __split_and_process_bio(struct clone_info *ci)
  1587	{
  1588		struct bio *clone;
  1589		struct dm_target *ti;
  1590		unsigned len;
  1591	
  1592		ti = dm_table_find_target(ci->map, ci->sector);
  1593		if (unlikely(!ti))
  1594			return BLK_STS_IOERR;
  1595		else if (unlikely(ci->is_abnormal_io))
  1596			return __process_abnormal_io(ci, ti);
  1597	
  1598		if ((unlikely(op_is_copy(ci->bio->bi_opf)) &&
  1599					max_io_len(ti, ci->sector) < ci->sector_count)) {
  1600			DMERR("%s: Error IO size(%u) is greater than maximum target size(%llu)\n",
  1601					__func__, ci->sector_count, max_io_len(ti, ci->sector));
> 1602			return -EIO;
  1603		}
  1604		/*
  1605		 * Only support bio polling for normal IO, and the target io is
  1606		 * exactly inside the dm_io instance (verified in dm_poll_dm_io)
  1607		 */
  1608		ci->submit_as_polled = ci->bio->bi_opf & REQ_POLLED;
  1609	
  1610		len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count);
  1611		setup_split_accounting(ci, len);
  1612		clone = alloc_tio(ci, ti, 0, &len, GFP_NOIO);
  1613		__map_bio(clone);
  1614	
  1615		ci->sector += len;
  1616		ci->sector_count -= len;
  1617	
  1618		return BLK_STS_OK;
  1619	}
  1620	

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