Message-ID: <546B10DA.3040504@huawei.com>
Date: Tue, 18 Nov 2014 17:26:50 +0800
From: "Yun Wu (Abel)" <wuyun.wu@huawei.com>
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To: Thomas Gleixner <tglx@linutronix.de>
CC: LKML <linux-kernel@vger.kernel.org>, Jiang Liu <jiang.liu@linux.intel.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "Grant Likely" <grant.likely@linaro.org>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Yingjoe Chen <yingjoe.chen@mediatek.com>,
        Yijing Wang <wangyijing@huawei.com>
Subject: Re: [patch 07/16] genirq: Introduce helper irq_domain_set_info()
 to reduce duplicated code
References: <20141112133941.647950773@linutronix.de> <20141112134120.393705922@linutronix.de>
In-Reply-To: <20141112134120.393705922@linutronix.de>
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Sender: linux-kernel-owner@vger.kernel.org

Hi Thomas, Jiang,
On 2014/11/12 21:43, Thomas Gleixner wrote:

> From: Jiang Liu <jiang.liu@linux.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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