linux-kernel - Re: [Patch irqdomain: Enhance irq_domain_free_irqs

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Message-ID: <alpine.DEB.2.11.1411231132160.6439@nanos>
Date:	Sun, 23 Nov 2014 11:33:31 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
cc:	Ingo Molnar <mingo@...hat.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [Patch irqdomain: Enhance irq_domain_free_irqs_common() to
 support parentless irqdomain

On Fri, 21 Nov 2014, Jiang Liu wrote:

> Originally irq_domain_free_irqs_common() is designed to be used by
> irqdomains with parent. But there are desires to reuse for parentless
> irqdomains for code reduction.
> So check domain->parent before invoking irq_domain_free_irqs_parent().
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
> Hi Thomas,
> 	This patch applies to tip/irq/irqdomain, it helps to reduce code
> size on ARM. Seems we still have chance to merge it into tip/irq/irqdomain:)
> Regards!
> Gerry
> ---
>  kernel/irq/irqdomain.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 029acf11efed..0449d2869e17 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -975,7 +975,8 @@ void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
>  		if (irq_data)
>  			irq_domain_reset_irq_data(irq_data);
>  	}
> -	irq_domain_free_irqs_parent(domain, virq, nr_irqs);
> +	if (domain->parent)
> +		irq_domain_free_irqs_parent(domain, virq, nr_irqs);

irq_domain_free_irqs_parent()
{
	if (domain->parent && domain->parent->ops->free)
	   	...
}

So the above is redundant and does not change anything.

Thanks,

	tglx
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