tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git arm-kill-set_fs-4 head: 134f7ea9688d79375ef1358d83bbafb8097ca965 commit: ee5be38e6bb994ddeaaab8d7762919f78736a565 [31/37] v4l2: remaining compat handlers config: x86_64-randconfig-s021-20200917 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-201-g24bdaac6-dirty git checkout ee5be38e6bb994ddeaaab8d7762919f78736a565 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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/media/v4l2-core/v4l2-compat-ioctl32.c:1379:9: sparse: sparse: switch with no cases drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1405:9: sparse: sparse: switch with no cases drivers/media/v4l2-core/v4l2-compat-ioctl32.c:913:13: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __user * @@ got unsigned int * @@ drivers/media/v4l2-core/v4l2-compat-ioctl32.c:913:13: sparse: expected void const volatile [noderef] __user * drivers/media/v4l2-core/v4l2-compat-ioctl32.c:913:13: sparse: got unsigned int * # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground arm-kill-set_fs-4 git checkout ee5be38e6bb994ddeaaab8d7762919f78736a565 vim +898 drivers/media/v4l2-core/v4l2-compat-ioctl32.c 888 889 static int put_v4l2_event32(struct v4l2_event *p64, 890 struct v4l2_event32 __user *p32) 891 { 892 if (put_user(p64->type, &p32->type) || 893 copy_to_user(&p32->u, &p64->u, sizeof(p64->u)) || 894 put_user(p64->pending, &p32->pending) || 895 put_user(p64->sequence, &p32->sequence) || 896 put_user(p64->timestamp.tv_sec, &p32->timestamp.tv_sec) || 897 put_user(p64->timestamp.tv_nsec, &p32->timestamp.tv_nsec) || 899 copy_to_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 900 return -EFAULT; 901 return 0; 902 } 903 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org