linux-kernel - Re: [PATCH] irq: fix a Kconfig dependency

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Date:	Fri, 31 Jan 2014 02:27:04 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	nitin.a.kamble@...el.com
cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irq: fix a Kconfig dependency

On Thu, 30 Jan 2014, nitin.a.kamble@...el.com wrote:

> From: Nitin A Kamble <nitin.a.kamble@...el.com>
> 
> The generic_chip.c uses interfaces from irq_domain.c which is controlled by
> the IRQ_DOMAIN config option.
> 
> Add a select statement in the Kconfig to reflect this requirement.
> 
> Without this fix, the generic_chip.c compilation fails like this:
> 
> linux/kernel/irq/generic-chip.c:400:11:
>   error: 'irq_domain_xlate_onetwocell' undeclared here (not in a function)
> 

You're not specifying which config option you have enabled that selects 
CONFIG_GENERIC_IRQ_CHIP and does not select CONFIG_IRQ_DOMAIN, but it does 
look like there is a dependency here.

So, if this dependency is reasonable, it begs the question of why we have 
CONFIG_GENERIC_IRQ_CHIP at all and shouldn't just make generic-chip.c 
depend on CONFIG_IRQ_DOMAIN.
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