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

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Message-ID: <86802c440806200020x3d204c8ct305711a6cbd9618c@mail.gmail.com>
Date:	Fri, 20 Jun 2008 00:20:44 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Len Brown" <lenb@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: update mptable v7

On Thu, Jun 19, 2008 at 11:47 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Len Brown <lenb@...nel.org> wrote:
>
>> > the patch did print out the old and updated mptable.
>> >
>> > and that feature is enabled via "update_mptable" command line.
>> >
>> >
>> > also it is useful for kexec from acpi kernel to no acpi kernel on MB
>> > with nvidia chipset with AMI BIOS.
>> > becuase irq routing is different from mptable and acpi.
>> >
>> > amd8111/amd8131 chipset with AMI bios has same irq routing from
>> > mptable and acpi.
>> >
>> > Phonix BIOS, has one setup option APIC/PIC, and if select APIC, then
>> > irq routing from mptable and acpi is the same with
>> > nvidia chipset.
>>
>> So you know this can't NEVER be reliable, yet you continue to push for
>> upstream changes that carry risk for all systems that DO work.
>
> Yinghai: Len has a point, could you please double-check that no
> potentially risky code runs by default anywhere, without a specific boot
> option? update_mptable is supposed to achieve that, but lets make sure
> it does its job.

will double check that, and would consider to add
CONFIG_UPDATE_MPTABLE to make it not be built in be default.

YH
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