linux-kernel - Re: [PATCH 03/21] ARM: shmobile: don't call irqchip

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Date:	Wed, 1 May 2013 10:54:30 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Simon Horman <horms+renesas@...ge.net.au>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Bastian Hecht <hechtb+renesas@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/21] ARM: shmobile: don't call irqchip_init unconditionally

On Thu, Apr 25, 2013 at 12:28 PM, Arnd Bergmann <arnd@...db.de> wrote:
> The irqchip_init function is only available when building
> with CONFIG_OF enabled, which causes this build failure for
> bonito_defconfig:
>
> arch/arm/mach-shmobile/built-in.o: In function `r8a7740_init_irq_of':
> :(.init.text+0x580): undefined reference to `irqchip_init'
>
> This makes both the OF and the ATAGS portion of the driver
> conditional, which avoids the build error and also results
> in smaller object code if not both are enabled, without the
> need for an #ifdef.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Bastian Hecht <hechtb+renesas@...il.com>
> Cc: Simon Horman <horms+renesas@...ge.net.au>
> Cc: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> ---
>  arch/arm/mach-shmobile/intc-r8a7740.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-shmobile/intc-r8a7740.c b/arch/arm/mach-shmobile/intc-r8a7740.c
> index 8871f77..5dc57f1 100644
> --- a/arch/arm/mach-shmobile/intc-r8a7740.c
> +++ b/arch/arm/mach-shmobile/intc-r8a7740.c
> @@ -53,14 +53,23 @@ static void __init r8a7740_init_irq_common(void)
>
>  void __init r8a7740_init_irq_of(void)
>  {
> +       if (!IS_ENABLED(CONFIG_OF))
> +               return;
> +
>         irqchip_init();

Why not have an empty irqchip_init? I'd guess we'll need this on other
platforms and your default mach.

Rob
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