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

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... 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(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) 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(a)openwrt.org&gt; :::::: CC: Wim Van Sebroeck <wim(a)iguana.be&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org