linux-kernel - Re: [PATCH 3/9] irq: convert generic-chip to use irq

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Date:	Thu, 15 Dec 2011 22:15:56 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Rob Herring <robherring2@...il.com>
CC:	Kevin Hilman <khilman@...com>, Kukjin Kim <kgene.kim@...sung.com>,
	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Barry Song <baohua.song@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/9] irq: convert generic-chip to use irq_domain

On Thu, Dec 15, 2011 at 07:56:41AM -0600, Rob Herring wrote:
[...]
> >> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> >> index eb763f7..2a2aac1 100644
> >> --- a/kernel/irq/irqdomain.c
> >> +++ b/kernel/irq/irqdomain.c
> >> @@ -39,7 +39,7 @@ void irq_domain_add(struct irq_domain *domain)
> >>                         return;
> >>                 }
> >>                 d->domain = domain;
> >> -               d->hwirq = hwirq;
> >> +               d->hwirq = hwirq - domain->hwirq_base;
> > 
> > This is a problem. It entirely defeats the point of hwirq_base and it
> > would break the GIC. We need to fix this in the generic irq chip.
> > 
> 
> I think I found a fix. Can you try 's/d->hwirq/(d->hwirq % 32)/' in
> generic-chip.c.
> 
Needless to try (will try later), this will work.  But again, what do
we need to change 'd->irq - d->irq_base' at all?

-- 
Regards,
Shawn

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