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To: vgoyal@in.ibm.com
Cc: Andrew Morton <akpm@osdl.org>, fastboot@osdl.org,
       linux-kernel@vger.kernel.org
Subject: Re: [Fastboot] [PATCH] i386: move apic init in init_IRQs
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From: ebiederm@xmission.com (Eric W. Biederman)
Date: Tue, 25 Oct 2005 01:17:03 -0600
In-Reply-To: <20051024130311.GA5853@in.ibm.com> (Vivek Goyal's message of
 "Mon, 24 Oct 2005 18:33:11 +0530")
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Vivek Goyal <vgoyal@in.ibm.com> writes:
> I have attached a patch with the mail which is now using
> boot_cpu_physical_apicid to hard set presence of boot cpu instead of
> hard_smp_processor_id(). But the interesting questoin remains why BIOS is
> not reporting the boot cpu.


Ok.  I don't know if we care but I do know why we were not seeing
the report from the bios about your boot processor.  We record
information about cpus for up to NR_CPUS, and since you had
a UP kernel NR_CPUS was one.

>>From your earlier boot log.

> ACPI: LAPIC (acpi_id[0x00] lapic_id[0x03] enabled)
> Processor #3 6:10 APIC version 17
> ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> Processor #0 6:10 APIC version 17
> WARNING: NR_CPUS limit of 1 reached.  Processor ignored.
> ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
> Processor #1 6:10 APIC version 17
> WARNING: NR_CPUS limit of 1 reached.  Processor ignored.
> ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
> Processor #2 6:10 APIC version 17
> WARNING: NR_CPUS limit of 1 reached.  Processor ignored.

So it looks like we have this problem completely fixed.  

I don't see a good way to ensure that we always record our boot
apicid when we boot a multiple processor system and only use one
processor.

Eric