linux-kernel - Re: [PATCH 11/15] x86: move enabling of io_apic to prepare

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Date:	Mon, 9 Jun 2008 22:08:53 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	"Glauber Costa" <gcosta@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu,
	hugh@...itas.com
Subject: Re: [PATCH 11/15] x86: move enabling of io_apic to prepare_cpus

On Mon, Jun 9, 2008 at 7:46 PM, Maciej W. Rozycki <macro@...ux-mips.org> wrote:
> On Mon, 9 Jun 2008, Maciej W. Rozycki wrote:
>
>> > we need clear_IO_APIC before enable setup error vector, in case there
>> > is wrong setting in ioapic by BIOS...
>>
>>  Fair enough, although it is still interesting why it would only trigger
>> in the 64-bit mode and why shouldn't the BIOS be fixed instead.
>
>  Then again -- what if X86_LOCAL_APIC is set, but X86_IO_APIC is not?

config X86_LOCAL_APIC
        def_bool y
        depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS ||
SMP) && !X86_VOYAGER) || X86_GENERICARCH))

config X86_IO_APIC
        def_bool y
        depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP &&
!(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))

for 64bit, those are all set.

for 32bit, may need to null stub if X86_IO_APIC is not set

YH
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