drivers/watchdog/rc32434_wdt.c:176:37: sparse: sparse: incorrect type in initializer (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   34e047aa16c0123bbae8e2f6df33e5ecc1f56601
commit: ddb002d6d6af12c45dd9d565cadf0f40b36b7c25 MIPS: uaccess: Reduce number of nested macros
date:   11 months ago
config: mips-randconfig-s032-20220319 (https://download.01.org/0day-ci/archive/20220320/202203201245.WYJq6i13-lkp@xxxxxxxxx/config)
compiler: mipsel-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ddb002d6d6af12c45dd9d565cadf0f40b36b7c25
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ddb002d6d6af12c45dd9d565cadf0f40b36b7c25
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips SHELL=/bin/bash drivers/watchdog/

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


sparse warnings: (new ones prefixed by >>)
   command-line: note: in included file:
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQUIRE redefined
   builtin:0:0: sparse: this was the original definition
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_SEQ_CST redefined
   builtin:0:0: sparse: this was the original definition
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQ_REL redefined
   builtin:0:0: sparse: this was the original definition
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_RELEASE redefined
   builtin:0:0: sparse: this was the original definition
>> drivers/watchdog/rc32434_wdt.c:176:37: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected char const [noderef] __user *__p @@     got char const * @@
   drivers/watchdog/rc32434_wdt.c:176:37: sparse:     expected char const [noderef] __user *__p
   drivers/watchdog/rc32434_wdt.c:176:37: sparse:     got char const *
   drivers/watchdog/rc32434_wdt.c:246:27: sparse: sparse: incorrect type in initializer (incompatible argument 2 (different address spaces)) @@     expected int ( *write )( ... ) @@     got int ( * )( ... ) @@
   drivers/watchdog/rc32434_wdt.c:246:27: sparse:     expected int ( *write )( ... )
   drivers/watchdog/rc32434_wdt.c:246:27: sparse:     got int ( * )( ... )

vim +176 drivers/watchdog/rc32434_wdt.c

03ec58568a3c66 Florian Fainelli 2008-02-25  163  
03ec58568a3c66 Florian Fainelli 2008-02-25  164  static ssize_t rc32434_wdt_write(struct file *file, const char *data,
03ec58568a3c66 Florian Fainelli 2008-02-25  165  				size_t len, loff_t *ppos)
03ec58568a3c66 Florian Fainelli 2008-02-25  166  {
03ec58568a3c66 Florian Fainelli 2008-02-25  167  	if (len) {
03ec58568a3c66 Florian Fainelli 2008-02-25  168  		if (!nowayout) {
03ec58568a3c66 Florian Fainelli 2008-02-25  169  			size_t i;
03ec58568a3c66 Florian Fainelli 2008-02-25  170  
03ec58568a3c66 Florian Fainelli 2008-02-25  171  			/* In case it was set long ago */
03ec58568a3c66 Florian Fainelli 2008-02-25  172  			expect_close = 0;
03ec58568a3c66 Florian Fainelli 2008-02-25  173  
03ec58568a3c66 Florian Fainelli 2008-02-25  174  			for (i = 0; i != len; i++) {
03ec58568a3c66 Florian Fainelli 2008-02-25  175  				char c;
03ec58568a3c66 Florian Fainelli 2008-02-25 @176  				if (get_user(c, data + i))
03ec58568a3c66 Florian Fainelli 2008-02-25  177  					return -EFAULT;
03ec58568a3c66 Florian Fainelli 2008-02-25  178  				if (c == 'V')
0af98d37e85e69 Phil Sutter      2009-02-08  179  					expect_close = 42;
03ec58568a3c66 Florian Fainelli 2008-02-25  180  			}
03ec58568a3c66 Florian Fainelli 2008-02-25  181  		}
0af98d37e85e69 Phil Sutter      2009-02-08  182  		rc32434_wdt_ping();
03ec58568a3c66 Florian Fainelli 2008-02-25  183  		return len;
03ec58568a3c66 Florian Fainelli 2008-02-25  184  	}
03ec58568a3c66 Florian Fainelli 2008-02-25  185  	return 0;
03ec58568a3c66 Florian Fainelli 2008-02-25  186  }
03ec58568a3c66 Florian Fainelli 2008-02-25  187  

:::::: The code at line 176 was first introduced by commit
:::::: 03ec58568a3c66cac4b23ff74db95c966a1521de [WATCHDOG] Add support for the IDT RC32434 watchdog

:::::: TO: Florian Fainelli <florian.fainelli@xxxxxxxxxxxxx>
:::::: CC: Wim Van Sebroeck <wim@xxxxxxxxx>

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