Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on rafael-pm/linux-next] [also build test WARNING on v5.15 next-20211105] [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/james-liu-hpe-com/ACPI-OSL-Handle-the-return-value-of-acpi_os_map_generic_address-for-a-non-register-GAS/20211022-091959 base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-randconfig-r026-20211024 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 05c21f54a454ebfa44be7825707e6061dc32afab) 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 # https://github.com/0day-ci/linux/commit/f0340367a7885a3491d7b7c49f4c9bfc53e0b1dd git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review james-liu-hpe-com/ACPI-OSL-Handle-the-return-value-of-acpi_os_map_generic_address-for-a-non-register-GAS/20211022-091959 git checkout f0340367a7885a3491d7b7c49f4c9bfc53e0b1dd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/acpi/osl.c:467:29: warning: variable 'addr' is uninitialized when used here [-Wuninitialized] return acpi_os_map_iomem(addr, sizeof(unsigned long long)); ^~~~ drivers/acpi/osl.c:455:10: note: initialize the variable 'addr' to silence this warning u64 addr; ^ = 0 1 warning generated. vim +/addr +467 drivers/acpi/osl.c 452 453 void __iomem *acpi_os_map_generic_address(struct acpi_generic_address *gas) 454 { 455 u64 addr; 456 457 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 458 return NULL; 459 /* Handle a non-register GAS (i.e., a pointer to a data structure), 460 * whose bit width is expected to be 0 according to ACPI spec. 6.4. 461 * For example, The RegisterRegion field in SET_ERROR_TYPE_WITH_ADDRESS 462 * points to a data structure whose format is defined in Table 18.30 in 463 * ACPI Spec. 6.4 464 */ 465 if (!gas->bit_width) { 466 pr_info("Mapping IOMEM for a non-register GAS.\n"); > 467 return acpi_os_map_iomem(addr, sizeof(unsigned long long)); 468 } 469 470 /* Handle possible alignment issues */ 471 memcpy(&addr, &gas->address, sizeof(addr)); 472 if (!addr) 473 return NULL; 474 else 475 return acpi_os_map_iomem(addr, gas->bit_width / 8); 476 } 477 EXPORT_SYMBOL(acpi_os_map_generic_address); 478 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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