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

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Date:	Thu, 28 Mar 2013 15:25:42 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
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 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.

	Arnd
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