Hi "Rafael, I love your patch! Yet something to improve: [auto build test ERROR on pm/linux-next] [also build test ERROR on linux/master linus/master v5.12-rc3 next-20210317] [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/Rafael-J-Wysocki/ACPI-scan-Turn-... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-randconfig-c022-20210317 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/2462e52396b65921f0c83dfe19d5fcd99... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Rafael-J-Wysocki/ACPI-scan-Turn-off-unused-power-resources-during-initialization/20210318-005323 git checkout 2462e52396b65921f0c83dfe19d5fcd9927d3498 # save the attached .config to linux build tree make W=1 ARCH=x86_64 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: drivers/acpi/scan.o: in function `acpi_scan_init': vim +2363 drivers/acpi/scan.c 2290 2291 int __init acpi_scan_init(void) 2292 { 2293 int result; 2294 acpi_status status; 2295 struct acpi_table_stao *stao_ptr; 2296 2297 acpi_pci_root_init(); 2298 acpi_pci_link_init(); 2299 acpi_processor_init(); 2300 acpi_platform_init(); 2301 acpi_lpss_init(); 2302 acpi_apd_init(); 2303 acpi_cmos_rtc_init(); 2304 acpi_container_init(); 2305 acpi_memory_hotplug_init(); 2306 acpi_watchdog_init(); 2307 acpi_pnp_init(); 2308 acpi_int340x_thermal_init(); 2309 acpi_amba_init(); 2310 acpi_init_lpit(); 2311 2312 acpi_scan_add_handler(&generic_device_handler); 2313 2314 /* 2315 * If there is STAO table, check whether it needs to ignore the UART 2316 * device in SPCR table. 2317 */ 2318 status = acpi_get_table(ACPI_SIG_STAO, 0, 2319 (struct acpi_table_header **)&stao_ptr); 2320 if (ACPI_SUCCESS(status)) { 2321 if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) 2322 pr_info(PREFIX "STAO Name List not yet supported.\n"); 2323 2324 if (stao_ptr->ignore_uart) 2325 acpi_get_spcr_uart_addr(); 2326 2327 acpi_put_table((struct acpi_table_header *)stao_ptr); 2328 } 2329 2330 acpi_gpe_apply_masked_gpes(); 2331 acpi_update_all_gpes(); 2332 2333 /* 2334 * Although we call __add_memory() that is documented to require the 2335 * device_hotplug_lock, it is not necessary here because this is an 2336 * early code when userspace or any other code path cannot trigger 2337 * hotplug/hotunplug operations. 2338 */ 2339 mutex_lock(&acpi_scan_lock); 2340 /* 2341 * Enumerate devices in the ACPI namespace. 2342 */ 2343 result = acpi_bus_scan(ACPI_ROOT_OBJECT); 2344 if (result) 2345 goto out; 2346 2347 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); 2348 if (result) 2349 goto out; 2350 2351 /* Fixed feature devices do not exist on HW-reduced platform */ 2352 if (!acpi_gbl_reduced_hardware) { 2353 result = acpi_bus_scan_fixed(); 2354 if (result) { 2355 acpi_detach_data(acpi_root->handle, 2356 acpi_scan_drop_device); 2357 acpi_device_del(acpi_root); 2358 put_device(&acpi_root->dev); 2359 goto out; 2360 } 2361 } 2362 2364 2365 acpi_scan_initialized = true; 2366 2367 out: 2368 mutex_unlock(&acpi_scan_lock); 2369 return result; 2370 } 2371 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org