linux-kernel - Re: [PATCH 3/9] irq: convert generic-chip to use irq

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Date:	Wed, 14 Dec 2011 17:29:06 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, shawn.guo@...escale.com,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kevin Hilman <khilman@...com>,
	Tony Lindgren <tony@...mide.com>,
	Barry Song <baohua.song@....com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/9] irq: convert generic-chip to use irq_domain

On 12/14/2011 03:26 PM, Grant Likely wrote:
> On Wed, Dec 14, 2011 at 2:23 PM, Rob Herring <robherring2@...il.com> wrote:
>>
>>
>> On 12/14/2011 03:14 PM, Grant Likely wrote:
>>> On Wed, Dec 14, 2011 at 8:28 AM, Rob Herring <robherring2@...il.com> wrote:
>>>> From: Rob Herring <rob.herring@...xeda.com>
>>>>
>>>> Add irq domain support to irq generic-chip. This enables users of
>>>> generic-chip to support dynamic irq assignment needed for DT interrupt
>>>> binding. Users must be converted to use irq_data.hwirq for determining
>>>> local interrupt numbers rather than using the Linux irq number.
>>>>
>>>> irq_base is kept for now as there are a few users of it. Once they
>>>> are converted to use the irq domain, it can be removed.
>>>>
>>>> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
>>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>>> ---
>>>>  include/linux/irq.h       |    2 +-
>>>>  kernel/irq/Kconfig        |    1 +
>>>>  kernel/irq/generic-chip.c |   57 ++++++++++++++++++++++++++++----------------
>>>>  3 files changed, 38 insertions(+), 22 deletions(-)
>>>>
>>>> diff --git a/include/linux/irq.h b/include/linux/irq.h
>>>> index bff29c5..9ba8a30 100644
>>>> --- a/include/linux/irq.h
>>>> +++ b/include/linux/irq.h
>>>> @@ -664,7 +664,7 @@ struct irq_chip_generic {
>>>>        raw_spinlock_t          lock;
>>>>        void __iomem            *reg_base;
>>>>        unsigned int            irq_base;
>>>> -       unsigned int            irq_cnt;
>>>> +       struct irq_domain       *domain;
>>>
>>> Instead of making domain a pointer, why not embed the structure inside
>>> irq_chip_generic?  I don't see a reason for keeping it separate.
>>>
>>
>> There is a circular header dependency between irq.h and irq_domain.h.
>> Maybe I just need to put the include of irq_domain.h just above here
>> rather than the top of the file.
> 
> Yes, try that.  I'd rather get the dependency problem sorted out.
> Alternately, problematic bit of irq_domain.h can be moved to another
> header.
> 
Things always start out so simple...

Removing irq.h from irqdomain.h fixes my original problem. However, that
breaks on x86 since x86 has it's own struct irq_domain. Some ifdef'ing
could fix it since x86 doesn't use irq_chip_generic. Didn't you have
converting x86 in your original irq domain patches?

Rob
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