linux-kernel - Re: [PATCH] kernel/irq/handle.c fix kstat_irqs_cpu and irq_to

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Date:	Tue, 17 Mar 2009 00:52:31 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Ingo Molnar <mingo@...e.hu>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	ltt-dev@...ts.casi.polymtl.ca, danymadden@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/irq/handle.c fix kstat_irqs_cpu and irq_to_desc
 symbols

On Mon, 16 Mar 2009, Mathieu Desnoyers wrote:
> Mathieu :
> 
> This build problem was exhibited because of the added
> EXPORT_SYMBOL(irq_to_desc) in the LTTng tree, but only on powerpc.
> 
> Applies on 2.6.29-rc8.

Applies, but that does not make it a useful patch per se.

2.6.29-rc8/include/linux/irqnr.h has (condensed excerpt):

#ifndef CONFIG_GENERIC_HARDIRQS
#define nr_irqs                 NR_IRQS
#define irq_to_desc(irq)        (&irq_desc[irq])
#else
extern int nr_irqs;
extern struct irq_desc *irq_to_desc(unsigned int irq);
#endif  /* CONFIG_GENERIC_HARDIRQS */

And this adds right below of the #endif:
 
> +++ linux-2.6-lttng/include/linux/irqnr.h	2009-03-16 18:40:01.000000000 -0400
> @@ -38,6 +38,10 @@ extern struct irq_desc *irq_to_desc(unsi
>  
>  #endif /* CONFIG_GENERIC_HARDIRQS */
>  
> +extern int nr_irqs;
> +struct irq_desc;
> +extern struct irq_desc *irq_to_desc(unsigned int irq);
> +

Is this a contribution to the "most useless patch of the week"
contest ?

You have my vote.

    tglx


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