linux-kernel - Re: [PATCH 1/2] ARM: irq: Call irqchit_init if no init

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Date:	Thu, 28 Mar 2013 15:36:17 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Rob Herring <robherring2@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ARM: irq: Call irqchit_init if no init_irq
	function is specified

On Thu, Mar 28, 2013 at 03:25:42PM +0000, Arnd Bergmann wrote:
> On Thursday 28 March 2013, Russell King - ARM Linux wrote:
> > Better:
> > 
> > #ifdef CONFIG_OF
> >         if (!machine_desc->init_irq)
> >                 irqchip_init();
> >         else
> > #endif
> >                 machine_desc->init_irq();
> > 
> > which means we don't even get the test if !OF, and if someone mistakenly
> > sets this to NULL for a !OF platform, they get to know about it.
> 
> Right. With the new IS_DEFINED() macro, we could even turn this into
> 
> 	if (IS_DEFINED(CONFIG_OF) && !machine_desc->init_irq)
> 		irqchip_init();
> 	else
> 		machine_desc->init_irq();
> 
> to the same effect.

Provided irqchip_init() keeps its prototype visible, then yes.
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