linux-kernel - Re: Regression by 01f779f4862b ("irqchip/GIC: Don't deactivate interrupts forwarded to a guest")

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Message-ID: <55F9A402.1060408@arm.com>
Date:	Wed, 16 Sep 2015 18:16:50 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Jisheng Zhang <jszhang@...vell.com>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	jason@...edaemon.net, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: Regression by 01f779f4862b ("irqchip/GIC: Don't deactivate interrupts
 forwarded to a guest")

On 16/09/15 18:10, Jisheng Zhang wrote:
> Dear Thomas,
> 
> On Thu, 17 Sep 2015 00:59:08 +0800
> Jisheng Zhang <jszhang@...vell.com> wrote:
> 
>> On Wed, 16 Sep 2015 18:52:41 +0200
>> Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>>> On Thu, 17 Sep 2015, Jisheng Zhang wrote:
>>>
>>>> Hi Marc,
>>>>
>>>> Commit 01f779f4862b ("irqchip/GIC: Don't deactivate interrupts forwarded to a
>>>> guest") causes a regression on Marvell BG4CT SoC. In this SoC, there's only one
>>>> GIC, the secondary irq controller is Synopsys DW iCtl:
>>>> drivers/irqchip/irq-dw-apb-ictl.c
>>>>
>>>> So cascading_gic_irq() should return true on Marvell BG4CT SoC, but it returns
>>>> false. The logic in cascading_gic_irq() doesn't take cascaded irq controller
>>>> which is provided by non-gic controllers.
>>>
>>> I have a fix pending for this in
>>>
>>>   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.irq
>>>
>>> 714665351cc7: irqchip/gic: Use IRQD_FORWARDED_TO_VCPU flag
>>>
>>> Can you please give that a try?
>>
>> Sure, Will try and get back to you
> 
> Good news! The regression is fixed, cascaded irq works again!
> 
> Feel free to add
> 
> Tested-by: Jisheng Zhang <jszhang@...vell.com>

Ah, excellent. Probably a case of handler_data being reused... Thanks a
lot for testing this!

	M.
-- 
Jazz is not dead. It just smells funny...
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