How can I make sure that Linux have initialized all CPUs?

[Jacob Friis Larsen <jfl@list.idg.dk>]

I am running Debian stable with kernel 2.4.26-2-686 on a HP DL 140 with 
2 CPUs.

How can I make sure that Linux have initialized all CPUs?

# dmesg | grep "Initializing CPU"
Initializing CPU#0

Shouldn't there be at least 2, or 4 as I see this:
Processor #0 Pentium 4(tm) XEON(tm) APIC version 20
Processor #1 Pentium 4(tm) XEON(tm) APIC version 20
Processor #6 Pentium 4(tm) XEON(tm) APIC version 20
Processor #7 Pentium 4(tm) XEON(tm) APIC version 20

Thanks,
Jacob