linux-kernel - Re: [PATCH][POKE] Skip looking for ioapic overrides when ioapics are not present

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Date:	Thu, 31 Mar 2011 10:48:43 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Florian Mickler <florian@...kler.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	kurup_avinash@...oo.com, maciej.rutecki@...il.com, mingo@...e.hu,
	rjw@...k.pl, sedat.dilek@...il.com, zersaa@...il.com,
	stable@...nel.org
Subject: Re: [PATCH][POKE] Skip looking for ioapic overrides when ioapics
 are not present

(Something, somewhere, chocked on that "[.34+]@schatten.dmk.lab" address
that was in the CC list, so I removed it. Invalid address? Invalid TLD?)

On Thu, 2011-03-31 at 10:01 +0200, Florian Mickler wrote:
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 68df09b..3940103 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -3789,6 +3789,9 @@ int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
>  {
>  	int ioapic, pin, idx;
>  
> +	if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
> +		return -1;
> +
>  	if (skip_ioapic_setup)
>  		return -1;
>  

Seems to have the same goal as commit
678301ecadec24ff77ab310eebf8a32ccddb1850 ("x86, ioapic: Don't warn about
non-existing IOAPICs if we have none"), which got merged in the v2.6.38
cycle (authored by me, signed off by Ingo Molnar). Maybe Eric's patch is
more correct. I can't say as I was happy with the effect of my patch
(ie, make an uninteresting error disappear) and didn't investigate any
further. I have also no desire to dive into this matter again.

Paul

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