linux-kernel - Re: [PATCH 02/12] irqdomain: Always update revmap when setting up a virq

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Date:	Sat, 16 Jun 2012 15:57:57 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org, Milton Miller <miltonm@....com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH 02/12] irqdomain: Always update revmap when setting up a
 virq

On Fri, 2012-06-15 at 23:01 -0600, Grant Likely wrote:
> At irq_setup_virq() time all of the data needed to update the reverse
> map is available, but the current code ignores it and relies upon the
> slow path to insert revmap records.  This patch adds revmap updating
> to the setup path so the slow path will no longer be necessary.

See my comments in patch 4...

Cheers,
Ben.

> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Rob Herring <rob.herring@...xeda.com>
> ---
>  kernel/irq/irqdomain.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 4161d2a..5c36722 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -393,6 +393,16 @@ static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
>  		return -1;
>  	}
>  
> +	switch (domain->revmap_type) {
> +	case IRQ_DOMAIN_MAP_LINEAR:
> +		if (hwirq < domain->revmap_data.linear.size)
> +			domain->revmap_data.linear.revmap[hwirq] = virq;
> +		break;
> +	case IRQ_DOMAIN_MAP_TREE:
> +		irq_radix_revmap_insert(domain, virq, hwirq);
> +		break;
> +	}
> +
>  	irq_clear_status_flags(virq, IRQ_NOREQUEST);
>  
>  	return 0;


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