linux-kernel - Re: [RFC v1 25/25] genirq: Kill the first parameter 'irq' of irq_flow_handler

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Message-ID: <555CAD21.7040907@linux.intel.com>
Date:	Wed, 20 May 2015 23:49:53 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Murali Karicheri <m-karicheri2@...com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Steve Longerbeam <slongerbeam@...il.com>,
	Gilad Avidov <gavidov@...eaurora.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, dmaengine@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC v1 25/25] genirq: Kill the first parameter 'irq' of irq_flow_handler_t

On 2015/5/20 23:40, Thomas Gleixner wrote:
> On Wed, 20 May 2015, Jiang Liu wrote:
>>  /* Chained IRQ handler for IPU error interrupt */
>> -static void ipu_irq_err(unsigned int irq, struct irq_desc *desc)
>> +static void ipu_irq_err(struct irq_desc *desc)
>>  {
>> +	unsigned int irq = irq_desc_to_irq(desc);
> 
> Why initializing? It's overwritten in the loop.
Hi Thomas,

I'm not familiar with the hardware, but if src2map() returns 0
on the first call, we need to initialize irq. Otherwise
generic_handle_irq(irq) will use random value on the first call.
---------------------------------------------------------
                        map = src2map(32 * i + line);
                        if (map)
                                irq = map->irq;
---------------------------------------------------------
Thanks!
Gerry

> 
>>  /* Chained IRQ handler for IPU function interrupt */
>> -static void ipu_irq_fn(unsigned int irq, struct irq_desc *desc)
>> +static void ipu_irq_fn(struct irq_desc *desc)
>>  {
>> +	unsigned int irq = irq_desc_to_irq(desc);
> 
> Ditto.
> 
> Thanks,
> 
> 	tglx
> 
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