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

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Message-ID: <49692953.1020405@sgi.com>
Date:	Sat, 10 Jan 2009 15:03:47 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
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

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?

Thanks,
Mike
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