Re: 2.6.16rc5 'found' an extra CPU.

[Dave Jones <davej@redhat.com>]

On Wed, Mar 01, 2006 at 07:52:19PM -0800, Ashok Raj wrote:
 > On Thu, Mar 02, 2006 at 02:38:31AM +0100, Andi Kleen wrote:
 > > 
 > > > ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
 > > > Processor #0 15:5 APIC version 16
 > > > ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
 > > > Processor #1 15:5 APIC version 16
 > > > ACPI: LAPIC (acpi_id[0x03] lapic_id[0x82] disabled)
 > > > ACPI: LAPIC (acpi_id[0x04] lapic_id[0x83] disabled)
 > > 
 > > It's because of the two disabled CPUs. We decreed at some point
 > > that disabled CPUs mean hotpluggable CPUs. But it's doing
 > > this for some time so you probably only noticed now.
 > > 
 > > All is ok. Sorry for blaming you wrongly, Ashok.
 > 
 > 
 > Phew!..
 > 
 > The ACPI hotplug code isnt in 2.6.15-rc* yet. It should be in the next
 > -mm when Andrew rolls the next mm.
 > 
 > But the 3 entries seem weird, we should only see 2 sysfs entries in 
 > /sys/devices/system/cpu and just 2 entries in proc/acpi/processor as well.

sysfs gets it right.

(23:11:01:davej@nemesis:~)$ ls /sys/devices/system/cpu/
cpu0/  cpu1/
(23:11:07:davej@nemesis:~)$ ls /proc/acpi/processor/
CPU1/  CPU2/  CPU3/
(23:11:11:davej@nemesis:~)$

		Dave