linux-kernel - Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC

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Date:	Sun, 14 Jun 2009 19:01:16 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because	there's
 no local APIC

On 06/12/09 13:11, Cyrill Gorcunov wrote:
> just for the record -- this removement has a side effect.
> Imagine I've passed "disableapic" so I expect as many as
> possible apic-related code would not pass thru execution.
> Now we would have (say for IBM Summit)
>
> acpi_parse_madt
>    default_acpi_madt_oem_check
>      summit_acpi_madt_oem_check
>        mark_tsc_unstable
>        setup_summit
>
> Dunno if it harmless or no but it changes kernel behaviour.
> cpu_has_apic cleared if disableapic option (which is early
> param) passed to kernel.
>
> Just a note. Didn't walk thru all ways.
>    

Yeah, that occured to me over the weekend.  Some of those cpu_has_apic 
tests should probably be replaced with explicit tests to see if noapic 
was specified.  I'll go over it with that in mind.

Thanks,
     J
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