linux-kernel - Re: [PATCH 2/4] irq: allocate irq_desc_ptrs array based on nr

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Date:	Sat, 10 Jan 2009 23:47:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Yinghai Lu <yinghai@...nel.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] irq: allocate irq_desc_ptrs array based on nr_irqs


* Mike Travis <travis@....com> wrote:

> +++ linux-2.6-for-ingo/kernel/irq/internals.h
> @@ -16,7 +16,11 @@ extern int __irq_set_trigger(struct irq_
>  extern struct lock_class_key irq_desc_lock_class;
>  extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
>  extern spinlock_t sparse_irq_lock;
> +#ifdef CONFIG_SPARSE_IRQ
> +extern struct irq_desc **irq_desc_ptrs;
> +#else
>  extern struct irq_desc *irq_desc_ptrs[NR_IRQS];
> +#endif

why the #ifdef? irq_desc_ptrs is only defined and used by sparseirq.

	Ingo
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