Hi Ashish, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/x86/core] [also build test ERROR on tip/x86/mm hch-configfs/for-next v5.10-rc4 next-20201117] [cannot apply to swiotlb/linux-next] [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/Ashish-Kalra/swiotlb-Adjust-SWIO... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970 config: i386-randconfig-r006-20201117 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/ec17437123f45040f2139e36122a4021f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ashish-Kalra/swiotlb-Adjust-SWIOTBL-bounce-buffer-size-for-SEV-guests/20201118-020049 git checkout ec17437123f45040f2139e36122a4021f1fd3b07 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: arch/x86/kernel/setup.o: in function `setup_arch': vim +1169 arch/x86/kernel/setup.c 1098 1099 reserve_real_mode(); 1100 1101 trim_platform_memory_ranges(); 1102 trim_low_memory_range(); 1103 1104 init_mem_mapping(); 1105 1106 idt_setup_early_pf(); 1107 1108 /* 1109 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features) 1110 * with the current CR4 value. This may not be necessary, but 1111 * auditing all the early-boot CR4 manipulation would be needed to 1112 * rule it out. 1113 * 1114 * Mask off features that don't work outside long mode (just 1115 * PCIDE for now). 1116 */ 1117 mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE; 1118 1119 memblock_set_current_limit(get_max_mapped()); 1120 1121 /* 1122 * NOTE: On x86-32, only from this point on, fixmaps are ready for use. 1123 */ 1124 1125 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT 1126 if (init_ohci1394_dma_early) 1127 init_ohci1394_dma_on_all_controllers(); 1128 #endif 1129 /* Allocate bigger log buffer */ 1130 setup_log_buf(1); 1131 1132 if (efi_enabled(EFI_BOOT)) { 1133 switch (boot_params.secure_boot) { 1134 case efi_secureboot_mode_disabled: 1135 pr_info("Secure boot disabled\n"); 1136 break; 1137 case efi_secureboot_mode_enabled: 1138 pr_info("Secure boot enabled\n"); 1139 break; 1140 default: 1141 pr_info("Secure boot could not be determined\n"); 1142 break; 1143 } 1144 } 1145 1146 reserve_initrd(); 1147 1148 acpi_table_upgrade(); 1149 1150 vsmp_init(); 1151 1152 io_delay_init(); 1153 1154 early_platform_quirks(); 1155 1156 /* 1157 * Parse the ACPI tables for possible boot-time SMP configuration. 1158 */ 1159 acpi_boot_table_init(); 1160 1161 early_acpi_boot_init(); 1162 1163 initmem_init(); 1164 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT); 1165 1166 if (boot_cpu_has(X86_FEATURE_GBPAGES)) 1167 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 1168 1170 1171 /* 1172 * Reserve memory for crash kernel after SRAT is parsed so that it 1173 * won't consume hotpluggable memory. 1174 */ 1175 reserve_crashkernel(); 1176 1177 memblock_find_dma_reserve(); 1178 1179 if (!early_xdbc_setup_hardware()) 1180 early_xdbc_register_console(); 1181 1182 x86_init.paging.pagetable_init(); 1183 1184 kasan_init(); 1185 1186 /* 1187 * Sync back kernel address range. 1188 * 1189 * FIXME: Can the later sync in setup_cpu_entry_areas() replace 1190 * this call? 1191 */ 1192 sync_initial_page_table(); 1193 1194 tboot_probe(); 1195 1196 map_vsyscall(); 1197 1198 generic_apic_probe(); 1199 1200 early_quirks(); 1201 1202 /* 1203 * Read APIC and some other early information from ACPI tables. 1204 */ 1205 acpi_boot_init(); 1206 sfi_init(); 1207 x86_dtb_init(); 1208 1209 /* 1210 * get boot-time SMP configuration: 1211 */ 1212 get_smp_config(); 1213 1214 /* 1215 * Systems w/o ACPI and mptables might not have it mapped the local 1216 * APIC yet, but prefill_possible_map() might need to access it. 1217 */ 1218 init_apic_mappings(); 1219 1220 prefill_possible_map(); 1221 1222 init_cpu_to_node(); 1223 1224 io_apic_init_mappings(); 1225 1226 x86_init.hyper.guest_late_init(); 1227 1228 e820__reserve_resources(); 1229 e820__register_nosave_regions(max_pfn); 1230 1231 x86_init.resources.reserve_resources(); 1232 1233 e820__setup_pci_gap(); 1234 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org