linux-kernel - Re: [PATCH] x86: update mptable v7

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Message-ID: <86802c440806181532g348864e1u3d067f8366046a7f@mail.gmail.com>
Date:	Wed, 18 Jun 2008 15:32:59 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Len Brown" <lenb@...nel.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: update mptable v7

On Wed, Jun 18, 2008 at 3:18 PM, Len Brown <lenb@...nel.org> wrote:
>
>
> On Sun, 1 Jun 2008, Yinghai Lu wrote:
>
>>
>> make mptable to be consistent to acpi routing, so we could
>> 1. kexec kernel with acpi=off
>> 2. workaround BIOS that acpi routing is working, but mptable is not right.
>>    so can use kernel/kexec to start other os that doesn't have good acpi support
>
> Is this an effort to boot an ACPI-mode kernel,
> and then kexec a non-ACPI kernel?

Yes,

>
> Doing so could confuse the heck out of the platform firmware,
> which will think that an ACPI-mode kernel is still running.
>
> Note that it is a historic artifact, now considered a bug,
> that ACPI uses the MPS code.  We should be divorcing these
> two bodies of code rather than mixing them further.

how about adding config option to not compile mptable related info?

YH
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