linux-kernel - Re: [PATCH v3] PCI: hosts: mark pcie/pci (msi) irq cascade handler as IRQF_NO

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Message-ID: <56969BE3.6000804@ti.com>
Date:	Wed, 13 Jan 2016 20:48:03 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Bjorn Helgaas <helgaas@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	<linux-pci@...r.kernel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	<tony@...mide.com>, <nsekhar@...com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-samsung-soc@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-sh@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Jingoo Han <jingoohan1@...il.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Thierry Reding <thierry.reding@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Pratyush Anand <pratyush.anand@...il.com>,
	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>
Subject: Re: [PATCH v3] PCI: hosts: mark pcie/pci (msi) irq cascade handler as
 IRQF_NO_THREAD

On 01/13/2016 07:50 PM, Bjorn Helgaas wrote:
> On Wed, Jan 13, 2016 at 02:39:04PM +0100, Sebastian Andrzej Siewior wrote:
>> * Bjorn Helgaas | 2016-01-06 16:18:27 [-0600]:
>>
>>> Hi Bjorn,
>>
>>>> diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
>>>> index 8c36880..0415192 100644
>>>> --- a/drivers/pci/host/pci-dra7xx.c
>>>> +++ b/drivers/pci/host/pci-dra7xx.c
>>>> @@ -301,8 +301,19 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
>>>>   		return -EINVAL;
>>>>   	}
>>>>
>>>> +	/*
>>>> +	 * Mark dra7xx_pcie_msi IRQ as IRQF_NO_THREAD
>>>> +	 * On -RT and if kernel is booting with "threadirqs" cmd line parameter
>>>> +	 * the dra7xx_pcie_msi_irq_handler() will be forced threaded but,
>>>> +	 * in the same time, it's IRQ dispatcher and calls generic_handle_irq(),
>>>> +	 * which, in turn, will be resolved to handle_simple_irq() call.
>>>> +	 * The handle_simple_irq() expected to be called with IRQ disabled, as
>>>> +	 * result kernle will display warning:
>>>> +	 * "irq XXX handler YYY+0x0/0x14 enabled interrupts".
>>>> +	 */
>>
>> could you _please_ remove this coment? This kind of comment (if at all)
>> should be part of the commit message (which is the case more or less).
>
> IIRC, Grygorii specifically wanted to keep this comment in dra7xx, but

True.

> I do agree that this level of detail is more appropriate for a changelog.
>
> If Grygorii and Kishon don't object, I can update the patch to remove it.

But no objections from my side. Thanks a lot.

-- 
regards,
-grygorii