Hi Arnd, I love your patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] url: https://github.com/0day-ci/linux/commits/Arnd-Bergmann/staging-vchiq-rewo... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 8436f932d84b1d53d2f4a2fa88c7aacdb0313265 config: arm64-randconfig-s032-20200921 (attached as .config) compiler: aarch64-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 # 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=arm64 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/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1538:50: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected int enum vchiq_status ( *callback )( ... ) @@ got void [noderef] __user * @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1538:50: sparse: expected int enum vchiq_status ( *callback )( ... ) drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1538:50: sparse: got void [noderef] __user * drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1539:50: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void *userdata @@ got void [noderef] __user * @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1539:50: sparse: expected void *userdata drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1539:50: sparse: got void [noderef] __user * drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1654:39: sparse: got void [noderef] __user * drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1656:39: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void *userdata @@ got void [noderef] __user * @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1656:39: sparse: expected void *userdata drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1656:39: sparse: got void [noderef] __user * drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1714:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct vchiq_completion_data *__pu_val @@ got void [noderef] __user * @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1714:13: sparse: expected struct vchiq_completion_data *__pu_val drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1714:13: sparse: got void [noderef] __user * drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1717:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void **__pu_val @@ got void [noderef] __user * @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1717:13: sparse: expected void **__pu_val drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1717:13: sparse: got void [noderef] __user * drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1764:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct vchiq_completion_data *__pu_val @@ got struct vchiq_completion_data [noderef] __user *[assigned] completion @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1764:13: sparse: expected struct vchiq_completion_data *__pu_val drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1764:13: sparse: got struct vchiq_completion_data [noderef] __user *[assigned] completion drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1794:59: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __user *uptr @@ got struct vchiq_header *[addressable] header @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1794:59: sparse: expected void [noderef] __user *uptr drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1794:59: sparse: got struct vchiq_header *[addressable] header drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1796:45: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __user *uptr @@ got void *[addressable] service_userdata @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1796:45: sparse: expected void [noderef] __user *uptr drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1796:45: sparse: got void *[addressable] service_userdata drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1798:45: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __user *uptr @@ got void *[addressable] bulk_userdata @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1798:45: sparse: expected void [noderef] __user *uptr drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1798:45: sparse: got void *[addressable] bulk_userdata drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1847:45: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void *buf @@ got void [noderef] __user * @@ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1847:45: sparse: expected void *buf drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1847:45: sparse: got void [noderef] __user * # https://github.com/0day-ci/linux/commit/0e0191ba5a550b33d052c3639715f54e9... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Arnd-Bergmann/staging-vchiq-rework-compat-handling/20200918-185438 git checkout 0e0191ba5a550b33d052c3639715f54e970f6033 vim +1654 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c 1633 1634 #define VCHIQ_IOC_QUEUE_BULK_TRANSMIT32 \ 1635 _IOWR(VCHIQ_IOC_MAGIC, 5, struct vchiq_queue_bulk_transfer32) 1636 #define VCHIQ_IOC_QUEUE_BULK_RECEIVE32 \ 1637 _IOWR(VCHIQ_IOC_MAGIC, 6, struct vchiq_queue_bulk_transfer32) 1638 1639 static long 1640 vchiq_compat_ioctl_queue_bulk(struct file *file, 1641 unsigned int cmd, 1642 struct vchiq_queue_bulk_transfer32 __user *argp) 1643 { 1644 struct vchiq_queue_bulk_transfer32 args32; 1645 struct vchiq_queue_bulk_transfer args; 1646 enum vchiq_bulk_dir dir = (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT) ? 1647 VCHIQ_BULK_TRANSMIT : VCHIQ_BULK_RECEIVE; 1648 1649 if (copy_from_user(&args32, argp, sizeof(args32))) 1650 return -EFAULT; 1651 1652 args = (struct vchiq_queue_bulk_transfer) { 1653 .handle = args32.handle, 1655 .size = args32.size, 1656 .userdata = compat_ptr(args32.userdata), 1657 .mode = args32.mode, 1658 }; 1659 1660 return vchiq_irq_queue_bulk_tx_rx(file->private_data, &args, 1661 dir, &argp->mode); 1662 } 1663 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org