linux-2.6.16-rc1-mm2: new ACPI errors

Hi,
I've got 4 new ACPI errors during the boot sequence:

ACPI: Subsystem revision 20060113
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI Error (nsxfeval-0240): Handle is NULL and Pathname is relative ACPI Error (nsxfeval-0240): Handle is NULL and Pathname is relative ACPI Error (nsxfeval-0240): Handle is NULL and Pathname is relative ACPI Error (nsxfeval-0240): Handle is NULL and Pathname is relative
...

After some investigations it appears that the corresponding Pathname are _PR0, _PR1, _PR2 and _PR3 and are concerning the root node.

There is no _PRx in my dsdt so this error has probably always existed but has been made visible by the switch from ACPI_DEBUG_PRINT to ACPI_REPORT_ERROR in the latest ACPI patch.

Is this a real error ? Is it OK for my dsdt to lack these _PRx objects ?

Thanks

(this has already been reported some time ago:
http://marc.theaimsgroup.com/?l=linux-kernel&m=112429158821875&w=2)

(Please CC me)