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

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Date:	Thu, 28 Mar 2013 19:02:08 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Rob Herring <robherring2@...il.com>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>, 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 01:40:09PM -0500, Rob Herring wrote:
> On 03/28/2013 09:51 AM, Russell King - ARM Linux wrote:
> > On Thu, Mar 28, 2013 at 09:48:18AM -0500, Rob Herring wrote:
> >> On 03/28/2013 04:41 AM, Maxime Ripard wrote:
> >>> +	if (machine_desc->init_irq)
> >>> +		machine_desc->init_irq();
> >>> +	else
> >>> +		irqchip_init();
> >>
> >> There needs to be an empty version defined for !OF.
> > 
> > Better:
> > 
> > #ifdef CONFIG_OF
> > 	if (!machine_desc->init_irq)
> > 		irqchip_init();
> > 	else
> > #endif
> 
> Or the new style:
> 
> 	if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
> 		irqchip_init();
> 	else
> 
> That needs the empty version, but handles your case.

It shouldn't need the empty version at all - because the compiler should
optimize the "true" case away entirely.
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