tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git bleeding-edge head: 86e4182dd2d1465f6446863dd26da97ea069c8a2 commit: ca25f92b72d25457653dbf2a81f322235804fb05 [97/119] ACPICA: Use original data_table_region pointer for accesses config: i386-randconfig-a012-20211228 (https://download.01.org/0day-ci/archive/20211228/202112280907.gTYYYuB4-lkp@xxxxxxxxx/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7171af744543433ac75b232eb7dfdaef7efd4d7a) 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://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?id=ca25f92b72d25457653dbf2a81f322235804fb05 git remote add rafael-pm https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git git fetch --no-tags rafael-pm bleeding-edge git checkout ca25f92b72d25457653dbf2a81f322235804fb05 # 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=i386 SHELL=/bin/bash drivers/acpi/acpica/ 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/acpica/exregion.c:519:17: warning: performing pointer subtraction with a null pointer has undefined behavior [-Wnull-pointer-subtraction] (address - ACPI_PTR_TO_PHYSADDR(mapping->pointer)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/acpi/actypes.h:513:41: note: expanded from macro 'ACPI_PTR_TO_PHYSADDR' #define ACPI_PTR_TO_PHYSADDR(i) ACPI_TO_INTEGER(i) ^~~~~~~~~~~~~~~~~~ include/acpi/actypes.h:510:41: note: expanded from macro 'ACPI_TO_INTEGER' #define ACPI_TO_INTEGER(p) ACPI_PTR_DIFF (p, (void *) 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/acpi/actypes.h:505:79: note: expanded from macro 'ACPI_PTR_DIFF' #define ACPI_PTR_DIFF(a, b) ((acpi_size) (ACPI_CAST_PTR (u8, (a)) - ACPI_CAST_PTR (u8, (b)))) ^ ~~~~~~~~~~~~~~~~~~~~~~~ 1 warning generated. vim +519 drivers/acpi/acpica/exregion.c 486 487 /******************************************************************************* 488 * 489 * FUNCTION: acpi_ex_data_table_space_handler 490 * 491 * PARAMETERS: function - Read or Write operation 492 * address - Where in the space to read or write 493 * bit_width - Field width in bits (8, 16, or 32) 494 * value - Pointer to in or out value 495 * handler_context - Pointer to Handler's context 496 * region_context - Pointer to context specific to the 497 * accessed region 498 * 499 * RETURN: Status 500 * 501 * DESCRIPTION: Handler for the Data Table address space (Op Region) 502 * 503 ******************************************************************************/ 504 505 acpi_status 506 acpi_ex_data_table_space_handler(u32 function, 507 acpi_physical_address address, 508 u32 bit_width, 509 u64 *value, 510 void *handler_context, void *region_context) 511 { 512 struct acpi_data_table_space_context *mapping; 513 char *pointer; 514 515 ACPI_FUNCTION_TRACE(ex_data_table_space_handler); 516 517 mapping = (struct acpi_data_table_space_context *) region_context; 518 pointer = ACPI_CAST_PTR(char, mapping->pointer) + > 519 (address - ACPI_PTR_TO_PHYSADDR(mapping->pointer)); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
