linux-kernel - Re: [RFC] Genirq and CPU isolation

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Message-Id: <20080224174727.1a3f4dd7.randy.dunlap@oracle.com>
Date:	Sun, 24 Feb 2008 17:47:27 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Max Krasnyansky <maxk@...lcomm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC] Genirq and CPU isolation

On Fri, 22 Feb 2008 22:19:18 -0800 Max Krasnyansky wrote:

Hi Max,

> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index 438a014..e74db94 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -488,6 +491,26 @@ void free_irq(unsigned int irq, void *dev_id)
>  }
>  EXPORT_SYMBOL(free_irq);
>  
> +#ifndef CONFIG_AUTO_IRQ_AFFINITY
> +/**
> + * Generic version of the affinity autoselector.
> + * Called under desc->lock from setup_irq().
> + * btw Should we rename this to select_irq_affinity() ?
> + */

Please don't begin comment blocks with "/**" unless they are in
kernel-doc format.  (See Documentation/kernel-doc-nano-HOWTO.txt
for details of it.)

> +int select_smp_affinity(unsigned int irq)
> +{
> +	cpumask_t usable_cpus;
> +
> +	if (!irq_can_set_affinity(irq))
> +		return 0;
> +
> +	cpus_andnot(usable_cpus, cpu_online_map, cpu_isolated_map);
> +	irq_desc[irq].affinity = usable_cpus;
> +	irq_desc[irq].chip->set_affinity(irq, usable_cpus);
> +	return 0;
> +}
> +#endif
> +
>  /**
>   *	request_irq - allocate an interrupt line
>   *	@irq: Interrupt line to allocate

This one is in kernel-doc format.

---
~Randy
--
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