linux-kernel - Re: [PATCH v3] irqchip: omap-intc: add support for spurious irq handling

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Date:	Mon, 4 Jan 2016 14:05:33 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Tony Lindgren <tony@...mide.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	John Ogness <john.ogness@...utronix.de>,
	Felipe Balbi <balbi@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] irqchip: omap-intc: add support for spurious irq
 handling

Hi Thomas,

On Tuesday 15 December 2015 08:58 PM, Tony Lindgren wrote:
> * Sekhar Nori <nsekhar@...com> [151215 06:26]:
>> Under some conditions, irq sorting procedure used
>> by INTC can go wrong resulting in a spurious irq
>> getting reported.
>>
>> If this condition is not handled, it results in
>> endless stream of:
>>
>>     unexpected IRQ trap at vector 00
>>
>> messages from ack_bad_irq()
>>
>> Handle the spurious interrupt condition in omap-intc
>> driver to prevent this.
>>
>> Measurements using kernel function profiler on AM335x
>> EVM running at 720MHz show that after this patch
>> omap_intc_handle_irq() takes about 37.4us against
>> 34us before this patch.
>>
>> Signed-off-by: Sekhar Nori <nsekhar@...com>
> 
> Looks good to me, probably should get tagged Cc stable when
> committing:
> 
> Acked-by: Tony Lindgren <tony@...mide.com>

Can you please apply this if it looks good?

Thanks,
Sekhar
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