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

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Date:	Fri, 15 Jan 2016 12:31:30 -0600
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Grygorii Strashko <grygorii.strashko@...com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	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, 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 Thu, Jan 14, 2016 at 11:49:24AM +0530, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Thursday 14 January 2016 12:18 AM, Grygorii Strashko wrote:
> > 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.
> 
> I don't have any objections.

OK, I dropped it, thanks guys!

Bjorn