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

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Message-ID: <alpine.DEB.2.11.1411181102160.3909@nanos>
Date:	Tue, 18 Nov 2014 11:03:31 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 07/16] genirq: Introduce helper irq_domain_set_info() to
 reduce duplicated code

On Tue, 18 Nov 2014, Yun Wu (Abel) wrote:

> Hi Thomas, Jiang,
> On 2014/11/12 21:43, Thomas Gleixner wrote:
> 
> > From: Jiang Liu <jiang.liu@...ux.intel.com>
> [...]
> > +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);
> > +}
> 
> When stacked domain enabled, there will be a semantic shift to the linux interrupt
> identifiers. The @virq now delivers much more than before.
> More specifically, now we need both @virq and @domain, rather than only @irq, to
> determine which irq_data we want to configure. And once we configure @irq without
> providing the exact domain, it means we are configuring all the domains related to
> that @irq. So I think this routine just messed all things up.

You can mess up anything by using an interface in the wrong way. Open
coding will not make that harder.

Thanks,

	tglx
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