linux-kernel - Re: [PATCH] fix compile breakage caused by 2ae111cdd8d83ebf9de72e36e68a8c84b6ebbeea

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Date:	Fri, 31 Oct 2008 12:52:02 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix compile breakage caused by
	2ae111cdd8d83ebf9de72e36e68a8c84b6ebbeea

On Thu, 2008-10-30 at 23:06 +0100, Ingo Molnar wrote:
> * James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> 
> > >From bd011c0cc51ce1fbab95403a570a8b47ad6ba500 Mon Sep 17 00:00:00 2001
> > From: James Bottomley <James.Bottomley@...senPartnership.com>
> > Date: Wed, 29 Oct 2008 11:19:49 -0500
> > Subject: [VOYAGER] x86: Fix subarch compile breakage
> > 
> > commit 2ae111cdd8d83ebf9de72e36e68a8c84b6ebbeea
> > Author: Cyrill Gorcunov <gorcunov@...il.com>
> > Date:   Mon Aug 11 18:34:08 2008 +0400
> > 
> >     x86: apic interrupts - move assignments to irqinit_32.c, v2
> > 
> > Wrongly moved irq2 setup out of the mach-default/setup.c file.  This
> > causes a breakage on voyager which needs its own version.  Fix by
> > moving it back again.
> > 
> > Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
> > ---
> >  arch/x86/kernel/irqinit_32.c  |   12 ------------
> >  arch/x86/mach-default/setup.c |   12 ++++++++++++
> >  2 files changed, 12 insertions(+), 12 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c
> > index 845aa98..3928784 100644
> > --- a/arch/x86/kernel/irqinit_32.c
> > +++ b/arch/x86/kernel/irqinit_32.c
> > @@ -81,15 +81,6 @@ void __init init_ISA_irqs (void)
> >  	}
> >  }
> >  
> > -/*
> > - * IRQ2 is cascade interrupt to second interrupt controller
> > - */
> > -static struct irqaction irq2 = {
> > -	.handler = no_action,
> > -	.mask = CPU_MASK_NONE,
> > -	.name = "cascade",
> > -};
> > -
> >  DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
> >  	[0 ... IRQ0_VECTOR - 1] = -1,
> >  	[IRQ0_VECTOR] = 0,
> > @@ -167,9 +158,6 @@ void __init native_init_IRQ(void)
> >  	alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
> >  #endif
> >  
> > -	if (!acpi_ioapic)
> > -		setup_irq(2, &irq2);
> > -
> >  	/* setup after call gates are initialised (usually add in
> >  	 * the architecture specific gates)
> >  	 */
> > diff --git a/arch/x86/mach-default/setup.c b/arch/x86/mach-default/setup.c
> > index 37b9ae4..53b4202 100644
> > --- a/arch/x86/mach-default/setup.c
> > +++ b/arch/x86/mach-default/setup.c
> > @@ -38,6 +38,15 @@ void __init pre_intr_init_hook(void)
> >  	init_ISA_irqs();
> >  }
> >  
> > +/*
> > + * IRQ2 is cascade interrupt to second interrupt controller
> > + */
> > +static struct irqaction irq2 = {
> > +	.handler = no_action,
> > +	.mask = CPU_MASK_NONE,
> > +	.name = "cascade",
> > +};
> > +
> >  /**
> >   * intr_init_hook - post gate setup interrupt initialisation
> >   *
> > @@ -53,6 +62,9 @@ void __init intr_init_hook(void)
> >  		if (x86_quirks->arch_intr_init())
> >  			return;
> >  	}
> > +	if (!acpi_ioapic)
> > +		setup_irq(2, &irq2);
> > +
> >  }
> 
> hm, this change looks backwards (doubly so ;-).
> 
> Is the build problem caused by the lack of the acpi_ioapic flag on 
> Voyager?

Yes, exactly ... and it has no apic or acpi ... I suppose something like
this could be used instead.

It would be fixable by stripping the irq2 setup from voyager and
directly #including asm/acpi.h in irqinit_32.c, but that would pull in
mpspec.h as well, with its associated problems.

an alternative might be to abstract out a explicit_irq2_setup variable
and making that be !acpi_ioapic on PC and 1 on voyager.

James



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