tree: https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git queue-next head: 68591fc13872b4971e7384508742e998a185efca commit: c6ca03a1d0da03615a68b6132e81605985ca2ce2 [1605/1612] RDMA/mlx5: Clarify what the UMR is for when creating MRs config: powerpc-randconfig-r035-20200913 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project d6fadc49e3d7eb0977bca3ff92bf156bd059fcd4) 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 c6ca03a1d0da03615a68b6132e81605985ca2ce2 # 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 (WARN_ON(access_flags & IB_ACCESS_ON_DEMAND)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/infiniband/hw/mlx5/mr.c:1253:17: note: uninitialized use occurs here return ERR_PTR(err); ^~~ drivers/infiniband/hw/mlx5/mr.c:1205:3: note: remove the 'if' if its condition is always false if (WARN_ON(access_flags & IB_ACCESS_ON_DEMAND)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/infiniband/hw/mlx5/mr.c:1185:9: note: initialize the variable 'err' to silence this warning int err; ^ = 0 1 warning generated. # https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git/commit... git remote add mellanox https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git git fetch --no-tags mellanox queue-next git checkout c6ca03a1d0da03615a68b6132e81605985ca2ce2 vim +1205 drivers/infiniband/hw/mlx5/mr.c 1168 1169 /* 1170 * If ibmr is NULL it will be allocated by reg_create. 1171 * Else, the given ibmr will be used. 1172 */ 1173 static struct mlx5_ib_mr *reg_create(struct ib_mr *ibmr, struct ib_pd *pd, 1174 u64 virt_addr, u64 length, 1175 struct ib_umem *umem, int npages, 1176 int page_shift, int access_flags, 1177 bool populate) 1178 { 1179 struct mlx5_ib_dev *dev = to_mdev(pd->device); 1180 struct mlx5_ib_mr *mr; 1181 __be64 *pas; 1182 void *mkc; 1183 int inlen; 1184 u32 *in; 1185 int err; 1186 bool pg_cap = !!(MLX5_CAP_GEN(dev->mdev, pg)); 1187 1188 mr = ibmr ? to_mmr(ibmr) : kzalloc(sizeof(*mr), GFP_KERNEL); 1189 if (!mr) 1190 return ERR_PTR(-ENOMEM); 1191 1192 mr->ibmr.pd = pd; 1193 mr->access_flags = access_flags; 1194 1195 inlen = MLX5_ST_SZ_BYTES(create_mkey_in); 1196 if (populate) 1197 inlen += sizeof(*pas) * roundup(npages, 2); 1198 in = kvzalloc(inlen, GFP_KERNEL); 1199 if (!in) { 1200 err = -ENOMEM; 1201 goto err_1; 1202 } 1203 pas = (__be64 *)MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt); 1204 if (populate) { 1206 goto err_2; 1207 mlx5_ib_populate_pas(dev, umem, page_shift, pas, 1208 pg_cap ? MLX5_IB_MTT_PRESENT : 0); 1209 } 1210 1211 /* The pg_access bit allows setting the access flags 1212 * in the page list submitted with the command. */ 1213 MLX5_SET(create_mkey_in, in, pg_access, !!(pg_cap)); 1214 1215 mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry); 1216 set_mkc_access_pd_addr_fields(mkc, access_flags, virt_addr, 1217 populate ? pd : dev->umrc.pd); 1218 MLX5_SET(mkc, mkc, free, !populate); 1219 MLX5_SET(mkc, mkc, access_mode_1_0, MLX5_MKC_ACCESS_MODE_MTT); 1220 MLX5_SET(mkc, mkc, umr_en, 1); 1221 1222 MLX5_SET64(mkc, mkc, len, length); 1223 MLX5_SET(mkc, mkc, bsf_octword_size, 0); 1224 MLX5_SET(mkc, mkc, translations_octword_size, 1225 get_octo_len(virt_addr, length, page_shift)); 1226 MLX5_SET(mkc, mkc, log_page_size, page_shift); 1227 if (populate) { 1228 MLX5_SET(create_mkey_in, in, translations_octword_actual_size, 1229 get_octo_len(virt_addr, length, page_shift)); 1230 } 1231 1232 err = mlx5_ib_create_mkey(dev, &mr->mmkey, in, inlen); 1233 if (err) { 1234 mlx5_ib_warn(dev, "create mkey failed\n"); 1235 goto err_2; 1236 } 1237 mr->mmkey.type = MLX5_MKEY_MR; 1238 mr->desc_size = sizeof(struct mlx5_mtt); 1239 mr->dev = dev; 1240 kvfree(in); 1241 1242 mlx5_ib_dbg(dev, "mkey = 0x%x\n", mr->mmkey.key); 1243 1244 return mr; 1245 1246 err_2: 1247 kvfree(in); 1248 1249 err_1: 1250 if (!ibmr) 1251 kfree(mr); 1252 1253 return ERR_PTR(err); 1254 } 1255 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org