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

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Date:	Sun, 11 Jan 2009 02:06:50 +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:

> Ingo Molnar wrote:
> > * 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
> 
> Hmm, good point.  I just modified as it was.
> 
> Should it only be:
> 
> 	#ifdef CONFIG_SPARSE_IRQ
> 	extern struct irq_desc **irq_desc_ptrs;
> 	#endif
> 
> Or do we normally declare something even though it won't be defined anywhere?

yeah, we tend to skip the #ifdefs whenever we can do so unpunished.

	Ingo
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