Hi Masahiro,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7af08140979a6e7e12b78c93b8625c8d25b084e2
commit: ea29b20a828511de3348334e529a3d046a180416 init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM
date:   5 weeks ago
config: s390-randconfig-s032-20210420 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
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: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea29b20a828511de3348334e529a3d046a180416
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ea29b20a828511de3348334e529a3d046a180416
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=s390 

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/watchdog/at91rm9200_wdt.c:219:27: sparse: sparse: incorrect type in initializer (incompatible argument 2 (different address spaces)) @@     expected long ( *write )( ... ) @@     got long ( * )( ... ) @@
   drivers/watchdog/at91rm9200_wdt.c:219:27: sparse:     expected long ( *write )( ... )
   drivers/watchdog/at91rm9200_wdt.c:219:27: sparse:     got long ( * )( ... )

vim +219 drivers/watchdog/at91rm9200_wdt.c

853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  211  
62322d2554d2f9 drivers/char/watchdog/at91_wdt.c  Arjan van de Ven 2006-07-03  212  static const struct file_operations at91wdt_fops = {
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  213  	.owner		= THIS_MODULE,
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  214  	.llseek		= no_llseek,
2760600da2a13d drivers/watchdog/at91rm9200_wdt.c Alan Cox         2008-05-19  215  	.unlocked_ioctl	= at91_wdt_ioctl,
b6dfb2477fb0bf drivers/watchdog/at91rm9200_wdt.c Arnd Bergmann    2019-06-03  216  	.compat_ioctl	= compat_ptr_ioctl,
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  217  	.open		= at91_wdt_open,
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  218  	.release	= at91_wdt_close,
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14 @219  	.write		= at91_wdt_write,
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  220  };
853807fb500a94 drivers/char/watchdog/at91_wdt.c  Andrew Victor    2006-03-14  221  

:::::: The code at line 219 was first introduced by commit
:::::: 853807fb500a9442d88646b7be92bfa51334f8e8 [WATCHDOG] at91_wdt.c - Atmel AT91RM9200 watchdog driver

:::::: TO: Andrew Victor <andrew@sanpeople.com>
:::::: CC: Wim Van Sebroeck <wim@iguana.be>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org