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

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Message-ID: <528387CF.5090105@arm.com>
Date:	Wed, 13 Nov 2013 14:08:15 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Vinayak Kale <vkale@....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 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.

Simply having
	return !!(desc->status_use_accessors & IRQ_PER_CPU);
should be enough.

> +}
> +
>  static inline void
>  irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
>  {
> 

Cheers,

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

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