linux-kernel - Re: [patch 07/16] genirq: Introduce helper irq_domain_set

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Message-ID: <54648C95.6020704@arm.com>
Date:	Thu, 13 Nov 2014 10:48:53 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 07/16] genirq: Introduce helper irq_domain_set_info()
 to reduce duplicated code

On 13/11/14 10:00, Jiang Liu wrote:
> On 2014/11/13 17:57, Yingjoe Chen wrote:
>> On Wed, 2014-11-12 at 13:43 +0000, Thomas Gleixner wrote:
>>> Index: tip/kernel/irq/irqdomain.c
>>> ===================================================================
>>> --- tip.orig/kernel/irq/irqdomain.c
>>> +++ tip/kernel/irq/irqdomain.c
>>> @@ -882,6 +882,16 @@ int irq_domain_set_hwirq_and_chip(struct
>>>  	return 0;
>>>  }
>>>  
>>> +void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
>>> +			 irq_hw_number_t hwirq, struct irq_chip *chip,
>>> +			 void *chip_data, irq_flow_handler_t handler,
>>> +			 void *handler_data, const char *handler_name)
>>> +{
>>> +	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
>>> +	__irq_set_handler(virq, handler, 0, handler_name);
>>> +	irq_set_handler_data(virq, handler_data);
>>> +}
>>> +
>>
>> Hi,
>>
>> While trying to use this function, I'm not sure about its interface.
>> This function have 8 parameters but only save 3 function calls. After
>> checking uses in Jiang's original patch, I think this make code harder
>> to understand.
> Hi Joe,
> 	It's true, but we also want to reduce duplicated code:(

I'm in two minds about this one.

Yes, it looks horrible (to be fair, I hate anything that has more than 3
or 4 parameters, because I can never remember what they're for).

On the other hand, it gives you a nice check-point in your code, with
all the bits you need to set, or at least consider. Because it depends
on so many things that you may have to construct/obtain, you quickly
realize that there is not that many locations in your stack that fits
these requirements. Yes, this a twisted reasoning.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

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