tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git driver-core-testing
head:   65b66682344a15ba2069d4dd8d0cc39cc3aed7e9
commit: 92ce7e83b4e5c86687d748ba53cb755acdce1256 [84/85] driver_find_device: Unify the match function with class_find_device()
config: s390-debug_defconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 92ce7e83b4e5c86687d748ba53cb755acdce1256
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=s390 

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

All warnings (new ones prefixed by >>):

   drivers/s390/cio/device.c: In function '__ccwdev_check_busid':
>> drivers/s390/cio/device.c:1660:9: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     bus_id = id;
            ^
--
   drivers/s390/cio/ccwgroup.c: In function '__ccwgroupdev_check_busid':
>> drivers/s390/cio/ccwgroup.c:613:17: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     char *bus_id = id;
                    ^~

vim +/const +1660 drivers/s390/cio/device.c

^1da177e Linus Torvalds   2005-04-16  1651  
^1da177e Linus Torvalds   2005-04-16  1652  /*
^1da177e Linus Torvalds   2005-04-16  1653   * get ccw_device matching the busid, but only if owned by cdrv
^1da177e Linus Torvalds   2005-04-16  1654   */
b0744bd2 Cornelia Huck    2005-06-25  1655  static int
92ce7e83 Suzuki K Poulose 2019-06-14  1656  __ccwdev_check_busid(struct device *dev, const void *id)
b0744bd2 Cornelia Huck    2005-06-25  1657  {
b0744bd2 Cornelia Huck    2005-06-25  1658  	char *bus_id;
b0744bd2 Cornelia Huck    2005-06-25  1659  
12975aef Cornelia Huck    2006-10-11 @1660  	bus_id = id;
b0744bd2 Cornelia Huck    2005-06-25  1661  
98df67b3 Kay Sievers      2008-12-25  1662  	return (strcmp(bus_id, dev_name(dev)) == 0);
b0744bd2 Cornelia Huck    2005-06-25  1663  }
b0744bd2 Cornelia Huck    2005-06-25  1664  

:::::: The code at line 1660 was first introduced by commit
:::::: 12975aef62836e9f3e179afaaded8045f8a25ac4 [S390] cio: remove casts from/to (void *).

:::::: TO: Cornelia Huck <cornelia.huck@de.ibm.com>
:::::: CC: Martin Schwidefsky <schwidefsky@de.ibm.com>

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