Hi, Is the following worth forwarding to the main list? It might be an artifact of my cross-compilation toolchain. Compilation without CONFIG_ACPI fails [1] because the headers include/acpi/* throw errors if included without CONFIG_ACPI. They are included unconditionally from two places: (1) acpi/acpi.h from iscsi_ibft.h from arch/x86/kernel/setup.c. The include of iscsi_ibft.h was harmless until an include of acpi/acpi.h was added to it in 4e639fdf0d0d745648aa62228ab8a0d9c03a563f (2) acpi/acpi_bus.h from pci-label.c, which used to only be compiled when ACPI was on, but that changed in 8a226e00eeed8db843d4a580013a49ae3559bcd7 to compile it even when only DMI and not ACPI is on. Putting CONFIG_ACPI guards around both includes lets the compilation proceed. [1] The errors are of this nature: include/acpi/actypes.h:55:2: error: #error ACPI_MACHINE_WIDTH not defined