Hi Nachammai, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] url: https://github.com/0day-ci/linux/commits/Nachammai-Karuppiah/staging-vc04_services-Avoid-NULL-comparison/20191008-143400 config: x86_64-allyesconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-13) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function 'vchiq_ioctl': >> drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:829:10: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while (service = next_service_by_instance(instance->state, ^~~~~~~ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function 'vchiq_instance_get_use_count': drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:2926:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while (service = next_service_by_instance(instance->state, ^~~~~~~ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function 'vchiq_instance_set_trace': drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:2953:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while (service = next_service_by_instance(instance->state, ^~~~~~~ vim +829 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c 798 799 /**************************************************************************** 800 * 801 * vchiq_ioctl 802 * 803 ***************************************************************************/ 804 static long 805 vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 806 { 807 VCHIQ_INSTANCE_T instance = file->private_data; 808 VCHIQ_STATUS_T status = VCHIQ_SUCCESS; 809 struct vchiq_service *service = NULL; 810 long ret = 0; 811 int i, rc; 812 813 DEBUG_INITIALISE(g_state.local) 814 815 vchiq_log_trace(vchiq_arm_log_level, 816 "%s - instance %pK, cmd %s, arg %lx", 817 __func__, instance, 818 ((_IOC_TYPE(cmd) == VCHIQ_IOC_MAGIC) && 819 (_IOC_NR(cmd) <= VCHIQ_IOC_MAX)) ? 820 ioctl_names[_IOC_NR(cmd)] : "<invalid>", arg); 821 822 switch (cmd) { 823 case VCHIQ_IOC_SHUTDOWN: 824 if (!instance->connected) 825 break; 826 827 /* Remove all services */ 828 i = 0; > 829 while (service = next_service_by_instance(instance->state, 830 instance, &i)) { 831 status = vchiq_remove_service(service->handle); 832 unlock_service(service); 833 if (status != VCHIQ_SUCCESS) 834 break; 835 } 836 service = NULL; 837 838 if (status == VCHIQ_SUCCESS) { 839 /* Wake the completion thread and ask it to exit */ 840 instance->closing = 1; 841 complete(&instance->insert_event); 842 } 843 844 break; 845 846 case VCHIQ_IOC_CONNECT: 847 if (instance->connected) { 848 ret = -EINVAL; 849 break; 850 } 851 rc = mutex_lock_killable(&instance->state->mutex); 852 if (rc) { 853 vchiq_log_error(vchiq_arm_log_level, 854 "vchiq: connect: could not lock mutex for " 855 "state %d: %d", 856 instance->state->id, rc); 857 ret = -EINTR; 858 break; 859 } 860 status = vchiq_connect_internal(instance->state, instance); 861 mutex_unlock(&instance->state->mutex); 862 863 if (status == VCHIQ_SUCCESS) 864 instance->connected = 1; 865 else 866 vchiq_log_error(vchiq_arm_log_level, 867 "vchiq: could not connect: %d", status); 868 break; 869 870 case VCHIQ_IOC_CREATE_SERVICE: { 871 struct vchiq_create_service args; 872 struct user_service *user_service = NULL; 873 void *userdata; 874 int srvstate; 875 876 if (copy_from_user(&args, (const void __user *)arg, 877 sizeof(args))) { 878 ret = -EFAULT; 879 break; 880 } 881 882 user_service = kmalloc(sizeof(*user_service), GFP_KERNEL); 883 if (!user_service) { 884 ret = -ENOMEM; 885 break; 886 } 887 888 if (args.is_open) { 889 if (!instance->connected) { 890 ret = -ENOTCONN; 891 kfree(user_service); 892 break; 893 } 894 srvstate = VCHIQ_SRVSTATE_OPENING; 895 } else { 896 srvstate = 897 instance->connected ? 898 VCHIQ_SRVSTATE_LISTENING : 899 VCHIQ_SRVSTATE_HIDDEN; 900 } 901 902 userdata = args.params.userdata; 903 args.params.callback = service_callback; 904 args.params.userdata = user_service; 905 service = vchiq_add_service_internal( 906 instance->state, 907 &args.params, srvstate, 908 instance, user_service_free); 909 910 if (service) { 911 user_service->service = service; 912 user_service->userdata = userdata; 913 user_service->instance = instance; 914 user_service->is_vchi = (args.is_vchi != 0); 915 user_service->dequeue_pending = 0; 916 user_service->close_pending = 0; 917 user_service->message_available_pos = 918 instance->completion_remove - 1; 919 user_service->msg_insert = 0; 920 user_service->msg_remove = 0; 921 init_completion(&user_service->insert_event); 922 init_completion(&user_service->remove_event); 923 init_completion(&user_service->close_event); 924 925 if (args.is_open) { 926 status = vchiq_open_service_internal 927 (service, instance->pid); 928 if (status != VCHIQ_SUCCESS) { 929 vchiq_remove_service(service->handle); 930 service = NULL; 931 ret = (status == VCHIQ_RETRY) ? 932 -EINTR : -EIO; 933 break; 934 } 935 } 936 937 if (copy_to_user((void __user *) 938 &(((struct vchiq_create_service __user *) 939 arg)->handle), 940 (const void *)&service->handle, 941 sizeof(service->handle))) { 942 ret = -EFAULT; 943 vchiq_remove_service(service->handle); 944 } 945 946 service = NULL; 947 } else { 948 ret = -EEXIST; 949 kfree(user_service); 950 } 951 } break; 952 953 case VCHIQ_IOC_CLOSE_SERVICE: 954 case VCHIQ_IOC_REMOVE_SERVICE: { 955 VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; 956 struct user_service *user_service; 957 958 service = find_service_for_instance(instance, handle); 959 if (!service) { 960 ret = -EINVAL; 961 break; 962 } 963 964 user_service = service->base.userdata; 965 966 /* close_pending is false on first entry, and when the 967 wait in vchiq_close_service has been interrupted. */ 968 if (!user_service->close_pending) { 969 status = (cmd == VCHIQ_IOC_CLOSE_SERVICE) ? 970 vchiq_close_service(service->handle) : 971 vchiq_remove_service(service->handle); 972 if (status != VCHIQ_SUCCESS) 973 break; 974 } 975 976 /* close_pending is true once the underlying service 977 has been closed until the client library calls the 978 CLOSE_DELIVERED ioctl, signalling close_event. */ 979 if (user_service->close_pending && 980 wait_for_completion_interruptible( 981 &user_service->close_event)) 982 status = VCHIQ_RETRY; 983 break; 984 } 985 986 case VCHIQ_IOC_USE_SERVICE: 987 case VCHIQ_IOC_RELEASE_SERVICE: { 988 VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; 989 990 service = find_service_for_instance(instance, handle); 991 if (service) { 992 status = (cmd == VCHIQ_IOC_USE_SERVICE) ? 993 vchiq_use_service_internal(service) : 994 vchiq_release_service_internal(service); 995 if (status != VCHIQ_SUCCESS) { 996 vchiq_log_error(vchiq_susp_log_level, 997 "%s: cmd %s returned error %d for " 998 "service %c%c%c%c:%03d", 999 __func__, 1000 (cmd == VCHIQ_IOC_USE_SERVICE) ? 1001 "VCHIQ_IOC_USE_SERVICE" : 1002 "VCHIQ_IOC_RELEASE_SERVICE", 1003 status, 1004 VCHIQ_FOURCC_AS_4CHARS( 1005 service->base.fourcc), 1006 service->client_id); 1007 ret = -EINVAL; 1008 } 1009 } else 1010 ret = -EINVAL; 1011 } break; 1012 1013 case VCHIQ_IOC_QUEUE_MESSAGE: { 1014 struct vchiq_queue_message args; 1015 1016 if (copy_from_user(&args, (const void __user *)arg, 1017 sizeof(args))) { 1018 ret = -EFAULT; 1019 break; 1020 } 1021 1022 service = find_service_for_instance(instance, args.handle); 1023 1024 if (service && (args.count <= MAX_ELEMENTS)) { 1025 /* Copy elements into kernel space */ 1026 struct vchiq_element elements[MAX_ELEMENTS]; 1027 1028 if (copy_from_user(elements, args.elements, 1029 args.count * sizeof(struct vchiq_element)) == 0) 1030 status = vchiq_ioc_queue_message 1031 (args.handle, 1032 elements, args.count); 1033 else 1034 ret = -EFAULT; 1035 } else { 1036 ret = -EINVAL; 1037 } 1038 } break; 1039 1040 case VCHIQ_IOC_QUEUE_BULK_TRANSMIT: 1041 case VCHIQ_IOC_QUEUE_BULK_RECEIVE: { 1042 struct vchiq_queue_bulk_transfer args; 1043 struct bulk_waiter_node *waiter = NULL; 1044 1045 VCHIQ_BULK_DIR_T dir = 1046 (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT) ? 1047 VCHIQ_BULK_TRANSMIT : VCHIQ_BULK_RECEIVE; 1048 1049 if (copy_from_user(&args, (const void __user *)arg, 1050 sizeof(args))) { 1051 ret = -EFAULT; 1052 break; 1053 } 1054 1055 service = find_service_for_instance(instance, args.handle); 1056 if (!service) { 1057 ret = -EINVAL; 1058 break; 1059 } 1060 1061 if (args.mode == VCHIQ_BULK_MODE_BLOCKING) { 1062 waiter = kzalloc(sizeof(struct bulk_waiter_node), 1063 GFP_KERNEL); 1064 if (!waiter) { 1065 ret = -ENOMEM; 1066 break; 1067 } 1068 1069 args.userdata = &waiter->bulk_waiter; 1070 } else if (args.mode == VCHIQ_BULK_MODE_WAITING) { 1071 mutex_lock(&instance->bulk_waiter_list_mutex); 1072 list_for_each_entry(waiter, &instance->bulk_waiter_list, 1073 list) { 1074 if (waiter->pid == current->pid) { 1075 list_del(&waiter->list); 1076 break; 1077 } 1078 } 1079 mutex_unlock(&instance->bulk_waiter_list_mutex); 1080 if (!waiter) { 1081 vchiq_log_error(vchiq_arm_log_level, 1082 "no bulk_waiter found for pid %d", 1083 current->pid); 1084 ret = -ESRCH; 1085 break; 1086 } 1087 vchiq_log_info(vchiq_arm_log_level, 1088 "found bulk_waiter %pK for pid %d", waiter, 1089 current->pid); 1090 args.userdata = &waiter->bulk_waiter; 1091 } 1092 1093 status = vchiq_bulk_transfer(args.handle, args.data, args.size, 1094 args.userdata, args.mode, dir); 1095 1096 if (!waiter) 1097 break; 1098 1099 if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) || 1100 !waiter->bulk_waiter.bulk) { 1101 if (waiter->bulk_waiter.bulk) { 1102 /* Cancel the signal when the transfer 1103 ** completes. */ 1104 spin_lock(&bulk_waiter_spinlock); 1105 waiter->bulk_waiter.bulk->userdata = NULL; 1106 spin_unlock(&bulk_waiter_spinlock); 1107 } 1108 kfree(waiter); 1109 } else { 1110 const VCHIQ_BULK_MODE_T mode_waiting = 1111 VCHIQ_BULK_MODE_WAITING; 1112 waiter->pid = current->pid; 1113 mutex_lock(&instance->bulk_waiter_list_mutex); 1114 list_add(&waiter->list, &instance->bulk_waiter_list); 1115 mutex_unlock(&instance->bulk_waiter_list_mutex); 1116 vchiq_log_info(vchiq_arm_log_level, 1117 "saved bulk_waiter %pK for pid %d", 1118 waiter, current->pid); 1119 1120 if (copy_to_user((void __user *) 1121 &(((struct vchiq_queue_bulk_transfer __user *) 1122 arg)->mode), 1123 (const void *)&mode_waiting, 1124 sizeof(mode_waiting))) 1125 ret = -EFAULT; 1126 } 1127 } break; 1128 1129 case VCHIQ_IOC_AWAIT_COMPLETION: { 1130 struct vchiq_await_completion args; 1131 1132 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 1133 if (!instance->connected) { 1134 ret = -ENOTCONN; 1135 break; 1136 } 1137 1138 if (copy_from_user(&args, (const void __user *)arg, 1139 sizeof(args))) { 1140 ret = -EFAULT; 1141 break; 1142 } 1143 1144 mutex_lock(&instance->completion_mutex); 1145 1146 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 1147 while ((instance->completion_remove == 1148 instance->completion_insert) 1149 && !instance->closing) { 1150 int rc; 1151 1152 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 1153 mutex_unlock(&instance->completion_mutex); 1154 rc = wait_for_completion_interruptible( 1155 &instance->insert_event); 1156 mutex_lock(&instance->completion_mutex); 1157 if (rc) { 1158 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 1159 vchiq_log_info(vchiq_arm_log_level, 1160 "AWAIT_COMPLETION interrupted"); 1161 ret = -EINTR; 1162 break; 1163 } 1164 } 1165 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 1166 1167 if (ret == 0) { 1168 int msgbufcount = args.msgbufcount; 1169 int remove = instance->completion_remove; 1170 1171 for (ret = 0; ret < args.count; ret++) { 1172 struct vchiq_completion_data *completion; 1173 struct vchiq_service *service; 1174 struct user_service *user_service; 1175 struct vchiq_header *header; 1176 1177 if (remove == instance->completion_insert) 1178 break; 1179 1180 completion = &instance->completions[ 1181 remove & (MAX_COMPLETIONS - 1)]; 1182 1183 /* 1184 * A read memory barrier is needed to stop 1185 * prefetch of a stale completion record 1186 */ 1187 rmb(); 1188 1189 service = completion->service_userdata; 1190 user_service = service->base.userdata; 1191 completion->service_userdata = 1192 user_service->userdata; 1193 1194 header = completion->header; 1195 if (header) { 1196 void __user *msgbuf; 1197 int msglen; 1198 1199 msglen = header->size + 1200 sizeof(struct vchiq_header); 1201 /* This must be a VCHIQ-style service */ 1202 if (args.msgbufsize < msglen) { 1203 vchiq_log_error( 1204 vchiq_arm_log_level, 1205 "header %pK: msgbufsize %x < msglen %x", 1206 header, args.msgbufsize, 1207 msglen); 1208 WARN(1, "invalid message " 1209 "size\n"); 1210 if (ret == 0) 1211 ret = -EMSGSIZE; 1212 break; 1213 } 1214 if (msgbufcount <= 0) 1215 /* Stall here for lack of a 1216 ** buffer for the message. */ 1217 break; 1218 /* Get the pointer from user space */ 1219 msgbufcount--; 1220 if (copy_from_user(&msgbuf, 1221 (const void __user *) 1222 &args.msgbufs[msgbufcount], 1223 sizeof(msgbuf))) { 1224 if (ret == 0) 1225 ret = -EFAULT; 1226 break; 1227 } 1228 1229 /* Copy the message to user space */ 1230 if (copy_to_user(msgbuf, header, 1231 msglen)) { 1232 if (ret == 0) 1233 ret = -EFAULT; 1234 break; 1235 } 1236 1237 /* Now it has been copied, the message 1238 ** can be released. */ 1239 vchiq_release_message(service->handle, 1240 header); 1241 1242 /* The completion must point to the 1243 ** msgbuf. */ 1244 completion->header = msgbuf; 1245 } 1246 1247 if ((completion->reason == 1248 VCHIQ_SERVICE_CLOSED) && 1249 !instance->use_close_delivered) 1250 unlock_service(service); 1251 1252 if (copy_to_user((void __user *)( 1253 (size_t)args.buf + ret * 1254 sizeof(struct vchiq_completion_data)), 1255 completion, 1256 sizeof(struct vchiq_completion_data))) { 1257 if (ret == 0) 1258 ret = -EFAULT; 1259 break; 1260 } 1261 1262 /* 1263 * Ensure that the above copy has completed 1264 * before advancing the remove pointer. 1265 */ 1266 mb(); 1267 remove++; 1268 instance->completion_remove = remove; 1269 } 1270 1271 if (msgbufcount != args.msgbufcount) { 1272 if (copy_to_user((void __user *) 1273 &((struct vchiq_await_completion *)arg) 1274 ->msgbufcount, 1275 &msgbufcount, 1276 sizeof(msgbufcount))) { 1277 ret = -EFAULT; 1278 } 1279 } 1280 } 1281 1282 if (ret) 1283 complete(&instance->remove_event); 1284 mutex_unlock(&instance->completion_mutex); 1285 DEBUG_TRACE(AWAIT_COMPLETION_LINE); 1286 } break; 1287 1288 case VCHIQ_IOC_DEQUEUE_MESSAGE: { 1289 struct vchiq_dequeue_message args; 1290 struct user_service *user_service; 1291 struct vchiq_header *header; 1292 1293 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 1294 if (copy_from_user(&args, (const void __user *)arg, 1295 sizeof(args))) { 1296 ret = -EFAULT; 1297 break; 1298 } 1299 service = find_service_for_instance(instance, args.handle); 1300 if (!service) { 1301 ret = -EINVAL; 1302 break; 1303 } 1304 user_service = (struct user_service *)service->base.userdata; 1305 if (user_service->is_vchi == 0) { 1306 ret = -EINVAL; 1307 break; 1308 } 1309 1310 spin_lock(&msg_queue_spinlock); 1311 if (user_service->msg_remove == user_service->msg_insert) { 1312 if (!args.blocking) { 1313 spin_unlock(&msg_queue_spinlock); 1314 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 1315 ret = -EWOULDBLOCK; 1316 break; 1317 } 1318 user_service->dequeue_pending = 1; 1319 do { 1320 spin_unlock(&msg_queue_spinlock); 1321 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 1322 if (wait_for_completion_interruptible( 1323 &user_service->insert_event)) { 1324 vchiq_log_info(vchiq_arm_log_level, 1325 "DEQUEUE_MESSAGE interrupted"); 1326 ret = -EINTR; 1327 break; 1328 } 1329 spin_lock(&msg_queue_spinlock); 1330 } while (user_service->msg_remove == 1331 user_service->msg_insert); 1332 1333 if (ret) 1334 break; 1335 } 1336 1337 BUG_ON((int)(user_service->msg_insert - 1338 user_service->msg_remove) < 0); 1339 1340 header = user_service->msg_queue[user_service->msg_remove & 1341 (MSG_QUEUE_SIZE - 1)]; 1342 user_service->msg_remove++; 1343 spin_unlock(&msg_queue_spinlock); 1344 1345 complete(&user_service->remove_event); 1346 if (!header) 1347 ret = -ENOTCONN; 1348 else if (header->size <= args.bufsize) { 1349 /* Copy to user space if msgbuf is not NULL */ 1350 if (!args.buf || 1351 (copy_to_user((void __user *)args.buf, 1352 header->data, 1353 header->size) == 0)) { 1354 ret = header->size; 1355 vchiq_release_message( 1356 service->handle, 1357 header); 1358 } else 1359 ret = -EFAULT; 1360 } else { 1361 vchiq_log_error(vchiq_arm_log_level, 1362 "header %pK: bufsize %x < size %x", 1363 header, args.bufsize, header->size); 1364 WARN(1, "invalid size\n"); 1365 ret = -EMSGSIZE; 1366 } 1367 DEBUG_TRACE(DEQUEUE_MESSAGE_LINE); 1368 } break; 1369 1370 case VCHIQ_IOC_GET_CLIENT_ID: { 1371 VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; 1372 1373 ret = vchiq_get_client_id(handle); 1374 } break; 1375 1376 case VCHIQ_IOC_GET_CONFIG: { 1377 struct vchiq_get_config args; 1378 struct vchiq_config config; 1379 1380 if (copy_from_user(&args, (const void __user *)arg, 1381 sizeof(args))) { 1382 ret = -EFAULT; 1383 break; 1384 } 1385 if (args.config_size > sizeof(config)) { 1386 ret = -EINVAL; 1387 break; 1388 } 1389 1390 vchiq_get_config(&config); 1391 if (copy_to_user(args.pconfig, &config, args.config_size)) { 1392 ret = -EFAULT; 1393 break; 1394 } 1395 } break; 1396 1397 case VCHIQ_IOC_SET_SERVICE_OPTION: { 1398 struct vchiq_set_service_option args; 1399 1400 if (copy_from_user(&args, (const void __user *)arg, 1401 sizeof(args))) { 1402 ret = -EFAULT; 1403 break; 1404 } 1405 1406 service = find_service_for_instance(instance, args.handle); 1407 if (!service) { 1408 ret = -EINVAL; 1409 break; 1410 } 1411 1412 status = vchiq_set_service_option( 1413 args.handle, args.option, args.value); 1414 } break; 1415 1416 case VCHIQ_IOC_LIB_VERSION: { 1417 unsigned int lib_version = (unsigned int)arg; 1418 1419 if (lib_version < VCHIQ_VERSION_MIN) 1420 ret = -EINVAL; 1421 else if (lib_version >= VCHIQ_VERSION_CLOSE_DELIVERED) 1422 instance->use_close_delivered = 1; 1423 } break; 1424 1425 case VCHIQ_IOC_CLOSE_DELIVERED: { 1426 VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg; 1427 1428 service = find_closed_service_for_instance(instance, handle); 1429 if (service) { 1430 struct user_service *user_service = 1431 (struct user_service *)service->base.userdata; 1432 close_delivered(user_service); 1433 } else 1434 ret = -EINVAL; 1435 } break; 1436 1437 default: 1438 ret = -ENOTTY; 1439 break; 1440 } 1441 1442 if (service) 1443 unlock_service(service); 1444 1445 if (ret == 0) { 1446 if (status == VCHIQ_ERROR) 1447 ret = -EIO; 1448 else if (status == VCHIQ_RETRY) 1449 ret = -EINTR; 1450 } 1451 1452 if ((status == VCHIQ_SUCCESS) && (ret < 0) && (ret != -EINTR) && 1453 (ret != -EWOULDBLOCK)) 1454 vchiq_log_info(vchiq_arm_log_level, 1455 " ioctl instance %pK, cmd %s -> status %d, %ld", 1456 instance, 1457 (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? 1458 ioctl_names[_IOC_NR(cmd)] : 1459 "<invalid>", 1460 status, ret); 1461 else 1462 vchiq_log_trace(vchiq_arm_log_level, 1463 " ioctl instance %pK, cmd %s -> status %d, %ld", 1464 instance, 1465 (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ? 1466 ioctl_names[_IOC_NR(cmd)] : 1467 "<invalid>", 1468 status, ret); 1469 1470 return ret; 1471 } 1472 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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