tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: ecd01009a68c85a017e3ae2d2189eab81a6272a6 commit: 0f7d0c8b66a415734cbd2c8a7afc586c4a1d61cc [1555/1555] iommu/vt-d:Add support for detecting ACPI device in RMRR config: x86_64-buildonly-randconfig-005-20250402 (https://download.01.org/0day-ci/archive/20250403/202504031027.4sVPB11F-lkp@i...) compiler: clang version 20.1.1 (https://github.com/llvm/llvm-project 424c2d9b7e4de40d0804dd374721e6411c27d1d1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250403/202504031027.4sVPB11F-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202504031027.4sVPB11F-lkp@intel.com/ All warnings (new ones prefixed by >>): drivers/iommu/dmar.c:769:38: warning: arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension [-Wgnu-null-pointer-arithmetic] 769 | if (!ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~ 770 | andd->device_name, | ~~~~~~~~~~~~~~~~~~ 771 | &h))) { | ~~~~ include/acpi/actypes.h:458:56: note: expanded from macro 'ACPI_ROOT_OBJECT' 458 | #define ACPI_ROOT_OBJECT ((acpi_handle) ACPI_TO_POINTER (ACPI_MAX_PTR)) | ^ include/acpi/actypes.h:509:41: note: expanded from macro 'ACPI_TO_POINTER' 509 | #define ACPI_TO_POINTER(i) ACPI_ADD_PTR (void, (void *) 0, (acpi_size) (i)) | ^ include/acpi/actypes.h:503:84: note: expanded from macro 'ACPI_ADD_PTR' 503 | #define ACPI_ADD_PTR(t, a, b) ACPI_CAST_PTR (t, (ACPI_CAST_PTR (u8, (a)) + (acpi_size)(b))) | ^ include/acpi/actypes.h:501:66: note: expanded from macro 'ACPI_CAST_PTR' 501 | #define ACPI_CAST_PTR(t, p) ((t *) (acpi_uintptr_t) (p)) | ^ include/acpi/acexcep.h:57:44: note: expanded from macro 'ACPI_SUCCESS' 57 | #define ACPI_SUCCESS(a) (!(a)) | ^ 1 warning generated. drivers/iommu/dmar.c:391: warning: Function parameter or member 'header' not described in 'dmar_parse_one_drhd' drivers/iommu/dmar.c:391: warning: Function parameter or member 'arg' not described in 'dmar_parse_one_drhd'

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drivers/iommu/dmar.o: warning: objtool: dmar_acpi_insert_dev_scope()+0xaf: unreachable instruction

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