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

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Message-ID: <546B10DA.3040504@huawei.com>
Date:	Tue, 18 Nov 2014 17:26:50 +0800
From:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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

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.

Regards,
	Abel

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