linux-kernel - Re: [Xen-devel] [PATCH v2 01/10] xen: remap GSIs as pirqs when running as initial domain

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Message-ID: <alpine.DEB.2.00.1010061802290.2440@kaball-desktop>
Date:	Wed, 6 Oct 2010 18:53:39 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>
Subject: Re: [Xen-devel] [PATCH v2 01/10] xen: remap GSIs as pirqs when
 running as initial domain

On Wed, 6 Oct 2010, Konrad Rzeszutek Wilk wrote:
> > > > +void __init xen_setup_pirqs(void)
> > > > +{
> > > > +	int irq;
> > > > +#ifndef CONFIG_SMP
> > > > +	int nr_ioapics = 1;
> > > > +#endif
> > > 
> > > Should this be defined in a header instead? Was this nr_ioapics==1
> > > meant to fall in the '0 == nr_ioapics' to setup the first sixteen
> > > irqs?
> > > 
> > > Is CONFIG_X86_IO_APIC more appropiate than CONFIG_SMP?
> > 
> > I think it was supposed to fix a compilation error in case
> > CONFIG_X86_IO_APIC is not set, so that in both cases in which an ioapic
> > is not present in the system or the ioapic support is not compiled in
> > the kernel we would fall in the '0 == nr_ioapics' code path.
> 
> That is what I thought, but nr_ioapics is set to one, so how do
> we fall in 0 == 1 code path?
> 
 
that was another mistake, I have fixed it now

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