[Devel] Why are empty packages invalid for predefined ACPI objects?

[-- Attachment #1: Type: text/plain, Size: 585 bytes --]

Hi,

The package validation function AcpiNsCheckPackage() in file nspredef.c
requires that packages be non-empty:

     /* The package must have at least one element, else invalid */

     if (!Count)
     {
         ACPI_WARN_PREDEFINED ((AE_INFO, Data->Pathname, Data->NodeFlags,
             "Return Package has no elements (empty)"));

         return (AE_AML_OPERAND_VALUE);
     }

I don't see, from the ACPI specification, why packages for predefined
ACPI objects must be non-empty.

Where does this requirement come from?

Best regards,

Grégoire Sutre