From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use
 irq_alloc_desc() instead
Date: Fri, 6 Apr 2012 13:17:04 +0200 (CEST)
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To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Grant Likely <grant.likely@secretlab.ca>, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, devicetree-discuss@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Milton Miller <miltonm@bga.com>, Rob Herring <rob.herring@calxeda.com>
List-Id: devicetree@vger.kernel.org

On Fri, 6 Apr 2012, Andreas Schwab wrote:

> Grant Likely <grant.likely@secretlab.ca> writes:
> 
> > Can you attach console output logs for each of configs above and also
> > with NR_IRQS=128?  That might give me some clues as to which specific
> > code is causing the issues.
> 
> It really looks like the issue starts when irq_expand_nr_irqs is called
> the first time to make nr_irqs bigger than NR_IRQS.

And it looks like the irqdomain code is the real culprit.

void irq_set_virq_count(unsigned int count)
{
        pr_debug("irq: Trying to set virq count to %d\n", count);

        BUG_ON(count < NUM_ISA_INTERRUPTS);
        if (count < NR_IRQS)
                irq_virq_count = count;
}

That looks simply wrong.....

s/NR_IRQS/nr_irqs/ should do the trick.

Thanks,

	tglx