linux-kernel - Re: [PATCH V2 1/2] genirq: Add an accessor for IRQ_PER

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Date:	Thu, 14 Nov 2013 16:01:53 +0530
From:	Vinayak Kale <vkale@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"patches@....com" <patches@....com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	Will Deacon <Will.Deacon@....com>,
	"jcm@...hat.com" <jcm@...hat.com>
Subject: Re: [PATCH V2 1/2] genirq: Add an accessor for IRQ_PER_CPU flag

Hi Mark,


On Wed, Nov 13, 2013 at 7:38 PM, Marc Zyngier <marc.zyngier@....com> wrote:
> Hi Vinayak,
>
> On 13/11/13 11:05, Vinayak Kale wrote:
>> This patch adds an accessor function for IRQ_PER_CPU flag.
>> The accessor function is useful to dertermine whether an IRQ is percpu or not.
>>
>> Signed-off-by: Vinayak Kale <vkale@....com>
>> ---
>>  include/linux/irqdesc.h |    8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
>> index 56fb646..acd8a3f 100644
>> --- a/include/linux/irqdesc.h
>> +++ b/include/linux/irqdesc.h
>> @@ -152,6 +152,14 @@ static inline int irq_balancing_disabled(unsigned int irq)
>>       return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
>>  }
>>
>> +static inline int irq_is_percpu(unsigned int irq)
>> +{
>> +     struct irq_desc *desc;
>> +
>> +     desc = irq_to_desc(irq);
>> +     return (desc && (desc->status_use_accessors & IRQ_PER_CPU)) ? 1 : 0;
>
> I don't think it is worth checking for the validity of "desc" here. All
> the other accessors assume that you've not passed a stupid "irq" value.
hmm..Okay, will remove the 'desc' validity check from here.
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