linux-kernel - Re: [PATCH] x86: let MPS support selectable

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Message-ID: <86802c440806191039q5c6a2266p82d319a61a3bba3c@mail.gmail.com>
Date:	Thu, 19 Jun 2008 10:39:16 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Daniel Exner" <dex@...gonslave.de>, "Len Brown" <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: let MPS support selectable

On Thu, Jun 19, 2008 at 8:10 AM, Maciej W. Rozycki <macro@...ux-mips.org> wrote:
> On Thu, 19 Jun 2008, Yinghai Lu wrote:
>
>> @@ -233,6 +233,19 @@ config SMP
>>
>>         If you don't know what to do here, say N.
>>
>> +config X86_FIND_SMP_CONFIG
>> +     def_bool y
>> +     depends on X86_MPPARSE || X86_VOYAGER || X86_VISWS
>> +     depends on X86_32
>> +
>> +config X86_MPPARSE
>> +     def_bool y
>> +     bool "Enable MPS table"
>> +     depends on (X86_32 && (X86_LOCAL_APIC && !X86_VISWS)) || X86_64
>> +     help
>> +       For old smp systems that do not have proper acpi support. Newer systems
>> +       (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
>> +
>>  choice
>>       prompt "Subarchitecture Type"
>>       default X86_PC
>
>  First of all you want to make sure at least one of ACPI and X86_MPPARSE
> is enabled if X86_LOCAL_APIC or you risk a known-broken kernel
> configuration, e.g. SMP which has no slightest chance to work.
>
>  Personally I'd be happy to see CONFIG_ACPI_BOOT we used to have at one
> point back just so that you can use ACPI tables to run an SMP system
> without the need to pull all the power management stuff.  Useful if the MP
> table is broken beyond recovery.  I am assuming it has been removed for a
> reason though.

thanks. will try to add CONFIG_ACPI_BOOT...

YH
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