Hi Randy, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2585cf9dfaaddf00b069673f27bb3f8530e2039c commit: 76215889be9d2cd388207545424bbbe3bf80e1ea watchdog: mtx-1: drop au1000.h header file date: 6 months ago config: mips-randconfig-s032-20211213 (https://download.01.org/0day-ci/archive/20211213/202112131443.4HWvLXx9-lk...) compiler: mips64-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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 76215889be9d2cd388207545424bbbe3bf80e1ea # 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(a)intel.com&gt; 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/mtx-1_wdt.c:184:27: sparse: expected long ( *write )( ... ) drivers/watchdog/mtx-1_wdt.c:184:27: sparse: got long ( * )( ... ) vim +184 drivers/watchdog/mtx-1_wdt.c 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 177 b47a166ed0baaa drivers/watchdog/mtx-1_wdt.c Jan Engelhardt 2008-01-22 178 static const struct file_operations mtx1_wdt_fops = { 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 179 .owner = THIS_MODULE, 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 180 .llseek = no_llseek, ed78c2da149247 drivers/watchdog/mtx-1_wdt.c Alan Cox 2008-05-19 181 .unlocked_ioctl = mtx1_wdt_ioctl, b6dfb2477fb0bf drivers/watchdog/mtx-1_wdt.c Arnd Bergmann 2019-06-03 182 .compat_ioctl = compat_ptr_ioctl, 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 183 .open = mtx1_wdt_open, 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 @184 .write = mtx1_wdt_write, 7944d3a5a70ee5 drivers/watchdog/mtx-1_wdt.c Wim Van Sebroeck 2008-08-06 185 .release = mtx1_wdt_release, 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 186 }; 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 187 04bf3b4f5fc033 drivers/char/watchdog/mtx-1_wdt.c Florian Fainelli 2007-05-06 188 :::::: The code at line 184 was first introduced by commit :::::: 04bf3b4f5fc033adf921f2e57d034ddbebef5fe7 [WATCHDOG] MTX-1 Watchdog driver :::::: TO: Florian Fainelli <florian.fainelli(a)int-evry.fr&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