Andi Kleen wrote:

on the Intel Xeon MP systems, too,

How so? The XAPIC version check should work there.

ACPI: LAPIC (acpi_id[0x11] lapic_id[0x21] enabled)
Processor #33 15:4 APIC version 16
ACPI: LAPIC (acpi_id[0x12] lapic_id[0x26] enabled)
Processor #38 15:4 APIC version 16

This is a boot message excerpt from one of the "Potomac" systems we have. x86_64 kernel without xapic check, therefore the CPUs are activated, but they wouldn't be on recent i386.

I fixed that in the 64bit version already, but not in 32bit yet.
Yes, the value of the APIC IDs must be used as indicator.

Great.
Regards, Martin


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