Hi Manisha, First bad commit (maybe != root cause): tree: https://github.com/mchinth/linux sep_socwatch_linux_5_9 head: c859e634bf058e7963fccc4c1219c1365e925ad4 commit: c859e634bf058e7963fccc4c1219c1365e925ad4 [1/1] platform/x86: Update SEP driver for 5.9 pull config: x86_64-randconfig-s022-20210413 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-280-g2cd6d34e-dirty # https://github.com/mchinth/linux/commit/c859e634bf058e7963fccc4c1219c1365... git remote add mchinth https://github.com/mchinth/linux git fetch --no-tags mchinth sep_socwatch_linux_5_9 git checkout c859e634bf058e7963fccc4c1219c1365e925ad4 # 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/platform/x86/socperf/socperfdrv.c:203:13: sparse: sparse: function 'SOCPERF_Read_Data3' with external linkage has definition drivers/platform/x86/socperf/socperfdrv.c:885:1: sparse: sparse: function 'SOCPERF_Switch_Group3' with external linkage has definition drivers/platform/x86/socperf/socperfdrv.c:101:22: sparse: sparse: symbol 'socperf_drv_version' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:102:5: sparse: sparse: symbol 'read_unc_ctr_info' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:103:10: sparse: sparse: symbol 'dispatch_uncore' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:104:12: sparse: sparse: symbol 'socperf_drv_cfg' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:105:14: sparse: sparse: symbol 'socperf_global_ec' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:106:14: sparse: sparse: symbol 'socperf_abnormal_terminate' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:107:11: sparse: sparse: symbol 'socperf_control' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:111:8: sparse: sparse: symbol 'socperf_pcb_size' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:984:28: sparse: sparse: Using plain integer as NULL pointer drivers/platform/x86/socperf/socperfdrv.c:1070:6: sparse: sparse: symbol 'lwpmudrv_Stop_Mem' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:1155:15: sparse: sparse: symbol 'socperf_Service_IOCTL' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:1274:6: sparse: sparse: symbol 'socperf_Device_Control' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:1334:18: sparse: sparse: cast removes address space '__user' of expression drivers/platform/x86/socperf/socperfdrv.c:1307:6: sparse: sparse: symbol 'socperf_Device_Control_Compat' was not declared. Should it be static? drivers/platform/x86/socperf/socperfdrv.c:1358:5: sparse: sparse: symbol 'SOCPERF_Abnormal_Terminate' was not declared. Should it be static? vim +/__user +1332 drivers/platform/x86/socperf/socperfdrv.c f57492d07625dd Manisha Chinthapally 2019-05-01 1305 f57492d07625dd Manisha Chinthapally 2019-05-01 1306 #if defined(CONFIG_COMPAT) && defined(DRV_EM64T) f57492d07625dd Manisha Chinthapally 2019-05-01 1307 long socperf_Device_Control_Compat(struct file *filp, unsigned int cmd, f57492d07625dd Manisha Chinthapally 2019-05-01 1308 unsigned long arg) f57492d07625dd Manisha Chinthapally 2019-05-01 1309 { f57492d07625dd Manisha Chinthapally 2019-05-01 1310 int status = OS_SUCCESS; f57492d07625dd Manisha Chinthapally 2019-05-01 1311 IOCTL_COMPAT_ARGS_NODE local_args_compat; f57492d07625dd Manisha Chinthapally 2019-05-01 1312 IOCTL_ARGS_NODE local_args; f57492d07625dd Manisha Chinthapally 2019-05-01 1313 f57492d07625dd Manisha Chinthapally 2019-05-01 1314 memset(&local_args_compat, 0, sizeof(IOCTL_COMPAT_ARGS_NODE)); f57492d07625dd Manisha Chinthapally 2019-05-01 1315 SOCPERF_PRINT_DEBUG("Compat: type: %d, subcommand: %d\n", f57492d07625dd Manisha Chinthapally 2019-05-01 1316 _IOC_TYPE(cmd), _IOC_NR(cmd)); f57492d07625dd Manisha Chinthapally 2019-05-01 1317 f57492d07625dd Manisha Chinthapally 2019-05-01 1318 if (_IOC_TYPE(cmd) != LWPMU_IOC_MAGIC) { f57492d07625dd Manisha Chinthapally 2019-05-01 1319 SOCPERF_PRINT_ERROR("Unknown IOCTL magic:%d\n", _IOC_TYPE(cmd)); f57492d07625dd Manisha Chinthapally 2019-05-01 1320 return OS_ILLEGAL_IOCTL; f57492d07625dd Manisha Chinthapally 2019-05-01 1321 } f57492d07625dd Manisha Chinthapally 2019-05-01 1322 f57492d07625dd Manisha Chinthapally 2019-05-01 1323 MUTEX_LOCK(ioctl_lock); f57492d07625dd Manisha Chinthapally 2019-05-01 1324 if (arg) { f57492d07625dd Manisha Chinthapally 2019-05-01 1325 status = copy_from_user(&local_args_compat, f57492d07625dd Manisha Chinthapally 2019-05-01 1326 (void __user *)arg, f57492d07625dd Manisha Chinthapally 2019-05-01 1327 sizeof(IOCTL_COMPAT_ARGS_NODE)); f57492d07625dd Manisha Chinthapally 2019-05-01 1328 } f57492d07625dd Manisha Chinthapally 2019-05-01 1329 local_args.len_drv_to_usr = local_args_compat.len_drv_to_usr; f57492d07625dd Manisha Chinthapally 2019-05-01 1330 local_args.len_usr_to_drv = local_args_compat.len_usr_to_drv; f57492d07625dd Manisha Chinthapally 2019-05-01 1331 local_args.buf_drv_to_usr = f57492d07625dd Manisha Chinthapally 2019-05-01 @1332 (char *)compat_ptr(local_args_compat.buf_drv_to_usr); f57492d07625dd Manisha Chinthapally 2019-05-01 1333 local_args.buf_usr_to_drv = f57492d07625dd Manisha Chinthapally 2019-05-01 1334 (char *)compat_ptr(local_args_compat.buf_usr_to_drv); f57492d07625dd Manisha Chinthapally 2019-05-01 1335 f57492d07625dd Manisha Chinthapally 2019-05-01 1336 status = socperf_Service_IOCTL(filp, _IOC_NR(cmd), local_args); f57492d07625dd Manisha Chinthapally 2019-05-01 1337 MUTEX_UNLOCK(ioctl_lock); f57492d07625dd Manisha Chinthapally 2019-05-01 1338 f57492d07625dd Manisha Chinthapally 2019-05-01 1339 return status; f57492d07625dd Manisha Chinthapally 2019-05-01 1340 } f57492d07625dd Manisha Chinthapally 2019-05-01 1341 #endif f57492d07625dd Manisha Chinthapally 2019-05-01 1342 :::::: The code at line 1332 was first introduced by commit :::::: f57492d07625dddac7920eccdb5be08c55ee16fa platform/x86: SOCPERF3 support for sep & socwatch :::::: TO: Manisha Chinthapally <manisha.chinthapally(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