ACPI_HW_OPTIONAL_FUNCTION  445 drivers/acpi/acpica/acmacros.h #define ACPI_HW_OPTIONAL_FUNCTION(addr)     addr
ACPI_HW_OPTIONAL_FUNCTION  447 drivers/acpi/acpica/acmacros.h #define ACPI_HW_OPTIONAL_FUNCTION(addr)     NULL