linux-kernel - Re: [PATCH v5 10/33] iommu, irq: Allocate irq_desc for dmar

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Date:	Fri, 21 Feb 2014 15:18:36 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Joerg Roedel <joro@...tes.org>,
	Donald Dutile <ddutile@...hat.com>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v5 10/33] iommu, irq: Allocate irq_desc for dmar_msi with
 local node

On Thu, Feb 20, 2014 at 11:43 PM, Jiang Liu <jiang.liu@...ux.intel.com> wrote:
>
>
> On 2014/1/3 8:05, Yinghai Lu wrote:
>> iommu irq's irq_desc should be on local node ram.
>>
>> Fix the return value checking problem.
>>   create_irq() will return -1 when fail to allocate.
>>   create_irq_nr() will return 0 when fail to allocate.
>> here only check !irq, so need to change it to use create_irq_nr instead.
>>
>> -v2: According to Sebastian, add cc to stable.
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> Cc: Joerg Roedel <joro@...tes.org>
>> Cc: Donald Dutile <ddutile@...hat.com>
>> Acked-by: Donald Dutile <ddutile@...hat.com>
>> Cc: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
>> Cc: stable@...r.kernel.org
>> ---
>>  drivers/iommu/dmar.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
>> index 8b452c9..f4eaa50 100644
>> --- a/drivers/iommu/dmar.c
>> +++ b/drivers/iommu/dmar.c
>> @@ -1277,7 +1277,7 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
>>       if (iommu->irq)
>>               return 0;
>>
>> -     irq = create_irq();
>> +     irq = create_irq_nr(0, iommu->node);
> Hi Yinghai,
>         How about create_irq_nrq(1, iommu->node) here to clearly state
> that 0 is not a valid irq number for dmar here?

Should be the same. that 0 or 1 will be from in __create_irqs().

And we have
        if (from < nr_irqs_gsi)
                from = nr_irqs_gsi;
in __create_irqs().

Thanks

Yinghai
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