linux-kernel - Re: [tip:irq/numa] x86: read apic ID in the !acpi

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Message-ID: <4A0AF84F.6060809@kernel.org>
Date:	Wed, 13 May 2009 09:41:51 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Cyrill Gorcunov <gorcunov@...il.com>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	eswierk@...stanetworks.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:irq/numa] x86: read apic ID in the !acpi_lapic case

Ingo Molnar wrote:
> * Yinghai Lu <yinghai@...nel.org> wrote:
> 
>> -	return hard_smp_processor_id() >> index_msb;
>> +	return initial_apic_id >> index_msb;
> 
>> -	unsigned apicid = hard_smp_processor_id();
>> +	unsigned apicid = cpu_has_apic ? hard_smp_processor_id() : c->apicid;
> 
>> -	int apicid = hard_smp_processor_id();
>> +	int apicid = cpu_has_apic ? hard_smp_processor_id() : c->apicid;
> 
> Doesnt such a pattern call for the pushing of that distinction into 
> hard_smp_processor_id() instead? (after a careful review of all 
> hard_smp_processor_id() call-sites)

don't want to burden system that have APIC to check that bit.

YH
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