linux-kernel - Re: [PATCH v2] x86, ioapic: Skip looking for ioapic overrides when ioapics are not present

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Date:	Fri, 01 Apr 2011 02:47:30 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Florian Mickler <florian@...kler.org>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	kurup_avinash@...oo.com, maciej.rutecki@...il.com, rjw@...k.pl,
	sedat.dilek@...il.com, stable@...nel.org, #.34+@...atten.dmk.lab
Subject: Re: [PATCH v2] x86, ioapic: Skip looking for ioapic overrides when
 ioapics are not present


> > --- a/arch/x86/kernel/apic/io_apic.c
> > +++ b/arch/x86/kernel/apic/io_apic.c
> > @@ -3789,6 +3789,10 @@ int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
> >  {
> >  	int ioapic, pin, idx;
> >  
> > +#ifdef CONFIG_ACPI
> > +	if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
> > +		return -1;
> > +#endif
> 
> That #ifdef is very ugly. Please introduce a suitable helper function in 
> arch/x86/include/asm/acpi.h - acpi_irq_ioapic_model() or so, which could be 
> used like this:
> 
> 	if (!acpi_irq_ioapic_model())
> 		return -1;
> 
> And would be defined in the !CONFIG_ACPI case as well.

It would be better to compile _none_ of acpi_get_override_irq() for !ACPI.

-Len

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