Hi Manisha, First bad commit (maybe != root cause): tree: https://github.com/mchinth/linux sep_socwatch_linux_5_10 head: c55df4a2b60fc7c6c4d00fd9f9fb447087833513 commit: 50ccb9f3611a1cff43d9df2e2b303f817ad00a4d [1/2] platform/x86: Update SEP driver for 5.10 pull config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220208/202202081901.wpMee2f6-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/mchinth/linux/commit/50ccb9f3611a1cff43d9df2e2b303f817... git remote add mchinth https://github.com/mchinth/linux git fetch --no-tags mchinth sep_socwatch_linux_5_10 git checkout 50ccb9f3611a1cff43d9df2e2b303f817ad00a4d # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/platform/x86/sepdk/pax/ drivers/platform/x86/sepdk/sep/ drivers/platform/x86/socperf/ 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/platform/x86/sepdk/pax/pax.c:765:18: sparse: sparse: cast removes address space '__user' of expression vim +/__user +763 drivers/platform/x86/sepdk/pax/pax.c d605aabab41663 Jon Moeller 2018-11-13 741 d605aabab41663 Jon Moeller 2018-11-13 742 #if defined(CONFIG_COMPAT) && defined(DRV_EM64T) d605aabab41663 Jon Moeller 2018-11-13 743 static IOCTL_OP_TYPE pax_Device_Control_Compat(struct file *filp, d605aabab41663 Jon Moeller 2018-11-13 744 unsigned int cmd, d605aabab41663 Jon Moeller 2018-11-13 745 unsigned long arg) d605aabab41663 Jon Moeller 2018-11-13 746 { d605aabab41663 Jon Moeller 2018-11-13 747 int status = OS_SUCCESS; d605aabab41663 Jon Moeller 2018-11-13 748 IOCTL_COMPAT_ARGS_NODE local_args_compat; d605aabab41663 Jon Moeller 2018-11-13 749 IOCTL_ARGS_NODE local_args; d605aabab41663 Jon Moeller 2018-11-13 750 d605aabab41663 Jon Moeller 2018-11-13 751 memset(&local_args_compat, 0, sizeof(IOCTL_COMPAT_ARGS_NODE)); d605aabab41663 Jon Moeller 2018-11-13 752 if (arg) { d605aabab41663 Jon Moeller 2018-11-13 753 status = copy_from_user(&local_args_compat, d605aabab41663 Jon Moeller 2018-11-13 754 (void __user *)arg, d605aabab41663 Jon Moeller 2018-11-13 755 sizeof(IOCTL_COMPAT_ARGS_NODE)); d605aabab41663 Jon Moeller 2018-11-13 756 if (status != OS_SUCCESS) d605aabab41663 Jon Moeller 2018-11-13 757 return status; d605aabab41663 Jon Moeller 2018-11-13 758 } d605aabab41663 Jon Moeller 2018-11-13 759 d605aabab41663 Jon Moeller 2018-11-13 760 local_args.len_drv_to_usr = local_args_compat.len_drv_to_usr; d605aabab41663 Jon Moeller 2018-11-13 761 local_args.len_usr_to_drv = local_args_compat.len_usr_to_drv; d605aabab41663 Jon Moeller 2018-11-13 762 local_args.buf_drv_to_usr = d605aabab41663 Jon Moeller 2018-11-13 @763 (char *)compat_ptr(local_args_compat.buf_drv_to_usr); d605aabab41663 Jon Moeller 2018-11-13 764 local_args.buf_usr_to_drv = d605aabab41663 Jon Moeller 2018-11-13 765 (char *)compat_ptr(local_args_compat.buf_usr_to_drv); d605aabab41663 Jon Moeller 2018-11-13 766 d605aabab41663 Jon Moeller 2018-11-13 767 local_args.command = cmd; d605aabab41663 Jon Moeller 2018-11-13 768 d605aabab41663 Jon Moeller 2018-11-13 769 status = pax_Service_IOCTL(filp, cmd, local_args); d605aabab41663 Jon Moeller 2018-11-13 770 d605aabab41663 Jon Moeller 2018-11-13 771 return status; d605aabab41663 Jon Moeller 2018-11-13 772 } d605aabab41663 Jon Moeller 2018-11-13 773 #endif d605aabab41663 Jon Moeller 2018-11-13 774 :::::: The code at line 763 was first introduced by commit :::::: d605aabab41663c9be9e8c549042933189adbf2f platform/x86: add sep and socwatch drivers without socperf. :::::: TO: Jon Moeller <jon.moeller(a)intel.com&gt; :::::: CC: Faycal Benmlih <faycal.benmlih(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org