[kbuild-all] drivers/rtc/rtc-m41t80.c:736:21: 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: eb5f95f1593f7c22dac681b19e815828e2af3efd commit: e5fc436f06eef54ef512ea55a9db8eb9f2e76959 sparse: use static inline for __chk_{user,io}_ptr() date: 3 weeks ago config: sh-randconfig-s032-20200919 (attached as .config) compiler: sh4-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: v0.6.2-201-g24bdaac6-dirty git checkout e5fc436f06eef54ef512ea55a9db8eb9f2e76959 # 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__' ARCH=sh 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/rtc/rtc-m41t80.c:736:21: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected int const *__gu_addr @@ got int [noderef] __user * @@ drivers/rtc/rtc-m41t80.c:736:21: sparse: expected int const *__gu_addr drivers/rtc/rtc-m41t80.c:736:21: sparse: got int [noderef] __user * drivers/rtc/rtc-m41t80.c:736:21: sparse: got int const *__gu_addr -- net/bluetooth/hci_core.c:2099:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned short const *__gu_addr @@ got unsigned short [noderef] [usertype] __user * @@ net/bluetooth/hci_core.c:2099:13: sparse: expected unsigned short const *__gu_addr net/bluetooth/hci_core.c:2099:13: sparse: got unsigned short [noderef] [usertype] __user * net/bluetooth/hci_core.c:2099:13: sparse: got unsigned short const *__gu_addr # 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 vim +736 drivers/rtc/rtc-m41t80.c 617780d290bd6e Atsushi Nemoto 2007-07-17 702 617780d290bd6e Atsushi Nemoto 2007-07-17 703 /** 617780d290bd6e Atsushi Nemoto 2007-07-17 704 * wdt_ioctl: 617780d290bd6e Atsushi Nemoto 2007-07-17 705 * @file: file handle to the device 617780d290bd6e Atsushi Nemoto 2007-07-17 706 * @cmd: watchdog command 617780d290bd6e Atsushi Nemoto 2007-07-17 707 * @arg: argument pointer 617780d290bd6e Atsushi Nemoto 2007-07-17 708 * 617780d290bd6e Atsushi Nemoto 2007-07-17 709 * The watchdog API defines a common set of functions for all watchdogs 617780d290bd6e Atsushi Nemoto 2007-07-17 710 * according to their available features. We only actually usefully support 617780d290bd6e Atsushi Nemoto 2007-07-17 711 * querying capabilities and current status. 617780d290bd6e Atsushi Nemoto 2007-07-17 712 */ 55929332c92e5d Arnd Bergmann 2010-04-27 713 static int wdt_ioctl(struct file *file, unsigned int cmd, 617780d290bd6e Atsushi Nemoto 2007-07-17 714 unsigned long arg) 617780d290bd6e Atsushi Nemoto 2007-07-17 715 { 617780d290bd6e Atsushi Nemoto 2007-07-17 716 int new_margin, rv; 617780d290bd6e Atsushi Nemoto 2007-07-17 717 static struct watchdog_info ident = { 617780d290bd6e Atsushi Nemoto 2007-07-17 718 .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | 617780d290bd6e Atsushi Nemoto 2007-07-17 719 WDIOF_SETTIMEOUT, 617780d290bd6e Atsushi Nemoto 2007-07-17 720 .firmware_version = 1, 617780d290bd6e Atsushi Nemoto 2007-07-17 721 .identity = "M41T80 WTD" 617780d290bd6e Atsushi Nemoto 2007-07-17 722 }; 617780d290bd6e Atsushi Nemoto 2007-07-17 723 617780d290bd6e Atsushi Nemoto 2007-07-17 724 switch (cmd) { 617780d290bd6e Atsushi Nemoto 2007-07-17 725 case WDIOC_GETSUPPORT: 617780d290bd6e Atsushi Nemoto 2007-07-17 726 return copy_to_user((struct watchdog_info __user *)arg, &ident, 617780d290bd6e Atsushi Nemoto 2007-07-17 727 sizeof(ident)) ? -EFAULT : 0; 617780d290bd6e Atsushi Nemoto 2007-07-17 728 617780d290bd6e Atsushi Nemoto 2007-07-17 729 case WDIOC_GETSTATUS: 617780d290bd6e Atsushi Nemoto 2007-07-17 730 case WDIOC_GETBOOTSTATUS: 617780d290bd6e Atsushi Nemoto 2007-07-17 731 return put_user(boot_flag, (int __user *)arg); 617780d290bd6e Atsushi Nemoto 2007-07-17 732 case WDIOC_KEEPALIVE: 617780d290bd6e Atsushi Nemoto 2007-07-17 733 wdt_ping(); 617780d290bd6e Atsushi Nemoto 2007-07-17 734 return 0; 617780d290bd6e Atsushi Nemoto 2007-07-17 735 case WDIOC_SETTIMEOUT: 617780d290bd6e Atsushi Nemoto 2007-07-17 @736 if (get_user(new_margin, (int __user *)arg)) 617780d290bd6e Atsushi Nemoto 2007-07-17 737 return -EFAULT; 617780d290bd6e Atsushi Nemoto 2007-07-17 738 /* Arbitrary, can't find the card's limits */ 617780d290bd6e Atsushi Nemoto 2007-07-17 739 if (new_margin < 1 || new_margin > 124) 617780d290bd6e Atsushi Nemoto 2007-07-17 740 return -EINVAL; 617780d290bd6e Atsushi Nemoto 2007-07-17 741 wdt_margin = new_margin; 617780d290bd6e Atsushi Nemoto 2007-07-17 742 wdt_ping(); c3e04915b8674a Gustavo A. R. Silva 2018-10-04 743 /* Fall through */ 617780d290bd6e Atsushi Nemoto 2007-07-17 744 case WDIOC_GETTIMEOUT: 617780d290bd6e Atsushi Nemoto 2007-07-17 745 return put_user(wdt_margin, (int __user *)arg); 617780d290bd6e Atsushi Nemoto 2007-07-17 746 617780d290bd6e Atsushi Nemoto 2007-07-17 747 case WDIOC_SETOPTIONS: 617780d290bd6e Atsushi Nemoto 2007-07-17 748 if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) 617780d290bd6e Atsushi Nemoto 2007-07-17 749 return -EFAULT; 617780d290bd6e Atsushi Nemoto 2007-07-17 750 617780d290bd6e Atsushi Nemoto 2007-07-17 751 if (rv & WDIOS_DISABLECARD) { a737e835e5769e Joe Perches 2015-04-16 752 pr_info("disable watchdog\n"); 617780d290bd6e Atsushi Nemoto 2007-07-17 753 wdt_disable(); 617780d290bd6e Atsushi Nemoto 2007-07-17 754 } 617780d290bd6e Atsushi Nemoto 2007-07-17 755 617780d290bd6e Atsushi Nemoto 2007-07-17 756 if (rv & WDIOS_ENABLECARD) { a737e835e5769e Joe Perches 2015-04-16 757 pr_info("enable watchdog\n"); 617780d290bd6e Atsushi Nemoto 2007-07-17 758 wdt_ping(); 617780d290bd6e Atsushi Nemoto 2007-07-17 759 } 617780d290bd6e Atsushi Nemoto 2007-07-17 760 617780d290bd6e Atsushi Nemoto 2007-07-17 761 return -EINVAL; 617780d290bd6e Atsushi Nemoto 2007-07-17 762 } 617780d290bd6e Atsushi Nemoto 2007-07-17 763 return -ENOTTY; 617780d290bd6e Atsushi Nemoto 2007-07-17 764 } 617780d290bd6e Atsushi Nemoto 2007-07-17 765 :::::: The code at line 736 was first introduced by commit :::::: 617780d290bd6eb2b260928c6acff5b7c6084154 rtc: watchdog support for rtc-m41t80 driver :::::: TO: Atsushi Nemoto <anemo(a)mba.ocn.ne.jp&gt; :::::: CC: Linus Torvalds <torvalds(a)woody.linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org