Hi Bob, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on v5.8] [cannot apply to linus/master v5.9-rc1 next-20200818] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Bob-Pearson/rdma_rxe-Added-SPDX-... base: bcf876870b95592b52519ed4aafcf9d95999bc9c config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 >>): drivers/infiniband/sw/rxe/rxe_mw.c: In function 'do_bind_mw': 227 | int ret; | ^~~ # https://github.com/0day-ci/linux/commit/01db430643deac98d0b280d7d6a0939c5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Bob-Pearson/rdma_rxe-Added-SPDX-headers-to-rxe-source-files/20200819-124026 git checkout 01db430643deac98d0b280d7d6a0939c5c0d7856 vim +/ret +227 drivers/infiniband/sw/rxe/rxe_mw.c 223 224 static int do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 225 struct rxe_mw *mw, struct rxe_mr *mr) 226 { 228 u32 rkey; 229 u32 new_rkey; 230 struct rxe_mw *duplicate_mw; 231 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 232 233 /* key part of new rkey is provided by user for type 2 234 * and ibv_bind_mw() for type 1 MWs 235 * there is a very rare chance that the new rkey will 236 * collide with an existing MW. Return an error if this 237 * occurs 238 */ 239 rkey = mw->ibmw.rkey; 240 new_rkey = (rkey & 0xffffff00) | (wqe->wr.wr.umw.rkey & 0x000000ff); 241 duplicate_mw = rxe_pool_get_key(&rxe->mw_pool, &new_rkey); 242 if (duplicate_mw) { 243 pr_err_once("new MW key is a duplicate, try another\n"); 244 rxe_drop_ref(duplicate_mw); 245 return -EINVAL; 246 } 247 248 rxe_drop_key(mw); 249 ret = rxe_add_key(mw, &new_rkey); 250 251 mw->access = wqe->wr.wr.umw.access; 252 mw->state = RXE_MEM_STATE_VALID; 253 mw->addr = wqe->wr.wr.umw.addr; 254 mw->length = wqe->wr.wr.umw.length; 255 256 if (mw->mr) { 257 rxe_drop_ref(mw->mr); 258 atomic_dec(&mw->mr->num_mw); 259 mw->mr = NULL; 260 } 261 262 if (mw->length) { 263 mw->mr = mr; 264 atomic_inc(&mr->num_mw); 265 rxe_add_ref(mr); 266 } 267 268 if (mw->ibmw.type == IB_MW_TYPE_2) 269 mw->qp = qp; 270 271 return 0; 272 } 273 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org