drivers/watchdog/ath79_wdt.c:161:37: sparse: sparse: incorrect type in argument 1 (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dfa377c35d70c31139b1274ec49f87d380996c42
commit: e5fc436f06eef54ef512ea55a9db8eb9f2e76959 sparse: use static inline for __chk_{user,io}_ptr()
date:   12 months ago
config: arm-randconfig-s031-20210814 (attached as .config)
compiler: arm-linux-gnueabi-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: v0.6.3-348-gf0e6938b-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e5fc436f06eef54ef512ea55a9db8eb9f2e76959
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout e5fc436f06eef54ef512ea55a9db8eb9f2e76959
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm 

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


sparse warnings: (new ones prefixed by >>)
>> drivers/watchdog/ath79_wdt.c:161:37: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __user *ptr @@     got char const * @@
   drivers/watchdog/ath79_wdt.c:161:37: sparse:     expected void const volatile [noderef] __user *ptr
   drivers/watchdog/ath79_wdt.c:161:37: sparse:     got char const *
   drivers/watchdog/ath79_wdt.c:235:27: sparse: sparse: incorrect type in initializer (incompatible argument 2 (different address spaces)) @@     expected int ( *write )( ... ) @@     got int ( * )( ... ) @@
   drivers/watchdog/ath79_wdt.c:235:27: sparse:     expected int ( *write )( ... )
   drivers/watchdog/ath79_wdt.c:235:27: sparse:     got int ( * )( ... )

vim +161 drivers/watchdog/ath79_wdt.c

f8394f61c66f48 Gabor Juhos 2011-01-04  148  
f8394f61c66f48 Gabor Juhos 2011-01-04  149  static ssize_t ath79_wdt_write(struct file *file, const char *data,
f8394f61c66f48 Gabor Juhos 2011-01-04  150  				size_t len, loff_t *ppos)
f8394f61c66f48 Gabor Juhos 2011-01-04  151  {
f8394f61c66f48 Gabor Juhos 2011-01-04  152  	if (len) {
f8394f61c66f48 Gabor Juhos 2011-01-04  153  		if (!nowayout) {
f8394f61c66f48 Gabor Juhos 2011-01-04  154  			size_t i;
f8394f61c66f48 Gabor Juhos 2011-01-04  155  
f8394f61c66f48 Gabor Juhos 2011-01-04  156  			clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
f8394f61c66f48 Gabor Juhos 2011-01-04  157  
f8394f61c66f48 Gabor Juhos 2011-01-04  158  			for (i = 0; i != len; i++) {
f8394f61c66f48 Gabor Juhos 2011-01-04  159  				char c;
f8394f61c66f48 Gabor Juhos 2011-01-04  160  
f8394f61c66f48 Gabor Juhos 2011-01-04 @161  				if (get_user(c, data + i))
f8394f61c66f48 Gabor Juhos 2011-01-04  162  					return -EFAULT;
f8394f61c66f48 Gabor Juhos 2011-01-04  163  
f8394f61c66f48 Gabor Juhos 2011-01-04  164  				if (c == 'V')
f8394f61c66f48 Gabor Juhos 2011-01-04  165  					set_bit(WDT_FLAGS_EXPECT_CLOSE,
f8394f61c66f48 Gabor Juhos 2011-01-04  166  						&wdt_flags);
f8394f61c66f48 Gabor Juhos 2011-01-04  167  			}
f8394f61c66f48 Gabor Juhos 2011-01-04  168  		}
f8394f61c66f48 Gabor Juhos 2011-01-04  169  
f8394f61c66f48 Gabor Juhos 2011-01-04  170  		ath79_wdt_keepalive();
f8394f61c66f48 Gabor Juhos 2011-01-04  171  	}
f8394f61c66f48 Gabor Juhos 2011-01-04  172  
f8394f61c66f48 Gabor Juhos 2011-01-04  173  	return len;
f8394f61c66f48 Gabor Juhos 2011-01-04  174  }
f8394f61c66f48 Gabor Juhos 2011-01-04  175  

:::::: The code at line 161 was first introduced by commit
:::::: f8394f61c66f48b1fe9d6964ddce492d7f9a4cd9 watchdog: add driver for the Atheros AR71XX/AR724X/AR913X SoCs

:::::: TO: Gabor Juhos <juhosg@xxxxxxxxxxx>
:::::: CC: Wim Van Sebroeck <wim@xxxxxxxxx>

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

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