Hi Zhou, Thank you for the patch! Yet something to improve: [auto build test ERROR on rafael-pm/linux-next] [also build test ERROR on linux/master linus/master v5.17-rc1 next-20220124] [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/Zhou-Qingyang/ACPI-tables-Fix-a-... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-randconfig-r011-20220124 (https://download.01.org/0day-ci/archive/20220125/202201251123.ScbhjE9a-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2e58a18910867ba6795066e044293e6daf89edf5) 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/924d4e212d2041e2af120ade3599fdc00... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Zhou-Qingyang/ACPI-tables-Fix-a-NULL-pointer-dereference-in-acpi_table_initrd_override/20220125-004517 git checkout 924d4e212d2041e2af120ade3599fdc00e0b12fd # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/ 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 >>): return AE_NO_MEMORY; ^ ~~~~~~~~~~~~ 1 error generated. vim +/acpi_table_initrd_scan +710 drivers/acpi/tables.c 695 696 static void __init acpi_table_initrd_scan(void) 697 { 698 int table_offset = 0; 699 int table_index = 0; 700 u32 table_length; 701 struct acpi_table_header *table; 702 703 if (!acpi_tables_addr) 704 return; 705 706 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 707 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 708 ACPI_HEADER_SIZE); 709 if (!table) { 711 } 712 713 if (table_offset + table->length > all_tables_size) { 714 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 715 WARN_ON(1); 716 return; 717 } 718 719 table_length = table->length; 720 721 /* Skip RSDT/XSDT which should only be used for override */ 722 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 723 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 724 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 725 goto next_table; 726 } 727 /* 728 * Mark the table to avoid being used in 729 * acpi_table_initrd_override(). Though this is not possible 730 * because override is disabled in acpi_install_physical_table(). 731 */ 732 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 733 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 734 goto next_table; 735 } 736 737 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 738 table->signature, table->oem_id, 739 table->oem_table_id); 740 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 741 acpi_install_physical_table(acpi_tables_addr + table_offset); 742 next_table: 743 table_offset += table_length; 744 table_index++; 745 } 746 } 747 #else 748 static acpi_status 749 acpi_table_initrd_override(struct acpi_table_header *existing_table, 750 acpi_physical_address *address, 751 u32 *table_length) 752 { 753 *table_length = 0; 754 *address = 0; 755 return AE_OK; 756 } 757 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org