linux-kernel - Re: 2.6.33-rc1: 6 Processors exceeds NR

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Message-Id: <200912261157.44469.tvrtko@ursulin.net>
Date:	Sat, 26 Dec 2009 11:57:44 +0000
From:	Tvrtko Ursulin <tvrtko@...ulin.net>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.33-rc1: 6 Processors exceeds NR_CPUS limit of 4

On Saturday 26 Dec 2009 05:47:34 Yinghai Lu wrote:
> On Fri, Dec 25, 2009 at 9:44 AM, Tvrtko Ursulin <tvrtko@...ulin.net> wrote:
> > Hi,
> >
> > Just noticed this message in dmesg. What is this about? Machine is
> > supposed to have a dual core CPU "unlocked" to four cores and it works
> > like that without any visible problems so far:
> 
> [    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x84] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x85] disabled)
> [    0.000000] ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
> [    0.000000] IOAPIC[0]: apic_id 4, version 33, address 0xfec00000, GSI
>  0-23 [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl
>  dfl) [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low
>  level) [    0.000000] ACPI: IRQ0 used by override.
> [    0.000000] ACPI: IRQ2 used by override.
> [    0.000000] ACPI: IRQ9 used by override.
> [    0.000000] Using ACPI (MADT) for SMP configuration information
> [    0.000000] ACPI: HPET id: 0x8300 base: 0xfed00000
> [    0.000000] 6 Processors exceeds NR_CPUS limit of 4
> 
> MADT has two disable entries...

I see. Does this mean ACPI is designed to support up to six CPUs, lets say 
some future models? Anyway I recompiled the kernel with 6 MAX_CPUS just to 
shut up this warning.

Tvrtko
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