Hi Kim, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: 87241c08286384feb3ddc57d4cb0daca4be1e384 commit: 41e55459e543de8850eff28ca732757370cd5da5 [192/9195] net: stmmac: Add support for MDIO interrupts config: parisc-randconfig-r021-20200811 (attached as .config) compiler: hppa-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 git checkout 41e55459e543de8850eff28ca732757370cd5da5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 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 >>): In file included from include/linux/mm.h:99, from include/linux/bvec.h:13, from include/linux/skbuff.h:17, from include/linux/if_ether.h:19, from include/linux/etherdevice.h:20, from drivers/net/ethernet/stmicro/stmmac/common.h:14, from drivers/net/ethernet/stmicro/stmmac/hwif.c:7: include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full': arch/parisc/include/asm/pgtable.h:91:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 91 | pte_t old_pte; \ | ^~~~~~~ arch/parisc/include/asm/pgtable.h:316:34: note: in expansion of macro 'set_pte_at' 316 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) | ^~~~~~~~~~ include/asm-generic/pgtable.h:201:2: note: in expansion of macro 'pte_clear' 201 | pte_clear(mm, address, ptep); | ^~~~~~~~~ include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit': arch/parisc/include/asm/pgtable.h:91:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 91 | pte_t old_pte; \ | ^~~~~~~ include/asm-generic/pgtable.h:629:2: note: in expansion of macro 'set_pte_at' 629 | set_pte_at(vma->vm_mm, addr, ptep, pte); | ^~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/hwif.c: In function 'stmmac_hwif_init': 287 | mac->mdio_intr_en = mac->mdio_intr_en ? : entry->mdio_intr_en; | ^ vim +/true +287 drivers/net/ethernet/stmicro/stmmac/hwif.c 225 226 int stmmac_hwif_init(struct stmmac_priv *priv) 227 { 228 bool needs_xgmac = priv->plat->has_xgmac; 229 bool needs_gmac4 = priv->plat->has_gmac4; 230 bool needs_gmac = priv->plat->has_gmac; 231 const struct stmmac_hwif_entry *entry; 232 struct mac_device_info *mac; 233 bool needs_setup = true; 234 int i, ret; 235 u32 id; 236 237 if (needs_gmac) { 238 id = stmmac_get_id(priv, GMAC_VERSION); 239 } else if (needs_gmac4 || needs_xgmac) { 240 id = stmmac_get_id(priv, GMAC4_VERSION); 241 } else { 242 id = 0; 243 } 244 245 /* Save ID for later use */ 246 priv->synopsys_id = id; 247 248 /* Lets assume some safe values first */ 249 priv->ptpaddr = priv->ioaddr + 250 (needs_gmac4 ? PTP_GMAC4_OFFSET : PTP_GMAC3_X_OFFSET); 251 priv->mmcaddr = priv->ioaddr + 252 (needs_gmac4 ? MMC_GMAC4_OFFSET : MMC_GMAC3_X_OFFSET); 253 254 /* Check for HW specific setup first */ 255 if (priv->plat->setup) { 256 mac = priv->plat->setup(priv); 257 needs_setup = false; 258 } else { 259 mac = devm_kzalloc(priv->device, sizeof(*mac), GFP_KERNEL); 260 } 261 262 if (!mac) 263 return -ENOMEM; 264 265 /* Fallback to generic HW */ 266 for (i = ARRAY_SIZE(stmmac_hw) - 1; i >= 0; i--) { 267 entry = &stmmac_hw[i]; 268 269 if (needs_gmac ^ entry->gmac) 270 continue; 271 if (needs_gmac4 ^ entry->gmac4) 272 continue; 273 if (needs_xgmac ^ entry->xgmac) 274 continue; 275 /* Use synopsys_id var because some setups can override this */ 276 if (priv->synopsys_id < entry->min_id) 277 continue; 278 279 /* Only use generic HW helpers if needed */ 280 mac->desc = mac->desc ? : entry->desc; 281 mac->dma = mac->dma ? : entry->dma; 282 mac->mac = mac->mac ? : entry->mac; 283 mac->ptp = mac->ptp ? : entry->hwtimestamp; 284 mac->mode = mac->mode ? : entry->mode; 285 mac->tc = mac->tc ? : entry->tc; 286 mac->mmc = mac->mmc ? : entry->mmc; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org