tree: https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git rdma-next head: 4c0870255a8dbe1caa2cdbccdd1632680e6a2201 commit: 244ea138ab718042f382e8083dd19752b1fd591e [68/81] RDMA/core: Introduce new GID table query API config: powerpc-randconfig-r032-20200913 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 3ed89b51da38f081fedb57727076262abb81d149) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu git checkout 244ea138ab718042f382e8083dd19752b1fd591e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (IS_ERR(ndev)) { ^~~~~~~~~~~~ drivers/infiniband/core/cache.c:1314:9: note: uninitialized use occurs here return ret; ^~~ drivers/infiniband/core/cache.c:1295:5: note: remove the 'if' if its condition is always false if (IS_ERR(ndev)) { ^~~~~~~~~~~~~~~~~~~ drivers/infiniband/core/cache.c:1265:30: note: initialize the variable 'ret' to silence this warning ssize_t num_entries = 0, ret; ^ = 0 1 warning generated. # https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git/commi... git remote add leon-rdma https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git git fetch --no-tags leon-rdma rdma-next git checkout 244ea138ab718042f382e8083dd19752b1fd591e vim +1295 drivers/infiniband/core/cache.c 1249 1250 /** 1251 * rdma_query_gid_table - Reads GID table entries of all the ports of a device up to max_entries. 1252 * @device: The device to query. 1253 * @entries: Entries where GID entries are returned. 1254 * @max_entries: Maximum number of entries that can be returned. 1255 * Entries array must be allocated to hold max_entries number of entries. 1256 * @num_entries: Updated to the number of entries that were successfully read. 1257 * 1258 * Returns number of entries on success or appropriate error code. 1259 */ 1260 ssize_t rdma_query_gid_table(struct ib_device *device, 1261 struct ib_uverbs_gid_entry *entries, 1262 size_t max_entries) 1263 { 1264 const struct ib_gid_attr *gid_attr; 1265 ssize_t num_entries = 0, ret; 1266 struct ib_gid_table *table; 1267 unsigned int port_num, i; 1268 struct net_device *ndev; 1269 unsigned long flags; 1270 1271 rdma_for_each_port(device, port_num) { 1272 if (!rdma_ib_or_roce(device, port_num)) 1273 continue; 1274 1275 table = rdma_gid_table(device, port_num); 1276 read_lock_irqsave(&table->rwlock, flags); 1277 for (i = 0; i < table->sz; i++) { 1278 if (!is_gid_entry_valid(table->data_vec[i])) 1279 continue; 1280 if (num_entries >= max_entries) { 1281 ret = -EINVAL; 1282 goto err; 1283 } 1284 1285 gid_attr = &table->data_vec[i]->attr; 1286 1287 memcpy(&entries->gid, &gid_attr->gid, 1288 sizeof(gid_attr->gid)); 1289 entries->gid_index = gid_attr->index; 1290 entries->port_num = gid_attr->port_num; 1291 entries->gid_type = gid_attr->gid_type; 1292 if (rdma_protocol_roce(device, port_num)) { 1293 rcu_read_lock(); 1294 ndev = rdma_read_gid_attr_ndev_rcu(gid_attr); 1296 rcu_read_unlock(); 1297 goto err; 1298 } 1299 entries->netdev_ifindex = ndev->ifindex; 1300 rcu_read_unlock(); 1301 } else { 1302 entries->netdev_ifindex = 0; 1303 } 1304 1305 num_entries++; 1306 entries++; 1307 } 1308 read_unlock_irqrestore(&table->rwlock, flags); 1309 } 1310 1311 return num_entries; 1312 err: 1313 read_unlock_irqrestore(&table->rwlock, flags); 1314 return ret; 1315 } 1316 EXPORT_SYMBOL(rdma_query_gid_table); 1317 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org