linux-kernel - Re: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use irq_alloc

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Date:	Thu, 05 Apr 2012 12:51:27 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Milton Miller <miltonm@....com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use irq_alloc_desc() instead

Grant Likely <grant.likely@...retlab.ca> writes:

> I bet it is NR_IRQS related.  You have SPARSE_IRQ enabled, which means
> the maximum number of irq_descs is IRQ_BITMAP_BITS (NR_IRQS + 8192).

The actual definition uses NR_IRQS + 8196.  Guess that's a typo.  (Does
it really make sense to add NR_IRQS here?)

> diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h
> index cf417e51..9edf499 100644
> --- a/arch/powerpc/include/asm/irq.h
> +++ b/arch/powerpc/include/asm/irq.h
> @@ -20,7 +20,7 @@
>  
>  /* Define a way to iterate across irqs. */
>  #define for_each_irq(i) \
> -       for ((i) = 0; (i) < NR_IRQS; ++(i))
> +       for ((i) = 0; (i) < nr_irqs; ++(i))

There are exactly two uses of for_each_irq, one is related to cpu
hotplug, the other to kexec, so that cannot make any difference.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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