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

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Date:	Tue, 04 Feb 2014 09:31:50 -0800
From:	"Kamble, Nitin A" <nitin.a.kamble@...el.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irq: fix a Kconfig dependency


On 1/31/2014 9:44 AM, Kamble, Nitin A wrote:
>
> On 1/31/2014 2:27 AM, David Rientjes wrote:
>> 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.
> It is enabled by GPIO_PCH as seen here:
>
> config GPIO_PCH
>         tristate "Intel EG20T PCH/LAPIS Semiconductor 
> IOH(ML7223/ML7831) GPIO"
>         depends on PCI && X86
>         select GENERIC_IRQ_CHIP
>         help
>           This driver is for PCH(Platform controller Hub) GPIO of 
> Intel Topcliff
>           which is an IOH(Input/Output Hub) for x86 embedded processor.
>           This driver can access PCH GPIO device.
>
>>
>> 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.
> Looking at the code there are cases where IRQ_DOMAIN functionality is 
> used
> without using the GENERIC_IRQ_CHIP. So making generic-chip.c depend
> on CONFIG_IRQ_DOMAIN in the makefile will reduce the flexibility of using
> these config options separately.
>
> Nitin
>
>
Hi David, Thomas,
   Is there any more feedback for this fix? Currently kernel is not 
building for the
affected platform without this fix. and I am happy to help here to get 
the fix
pulled in sooner. Let me know.

Thanks,
Nitin

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