linux-kernel - Re: [patch 16/47] genirq: Implement sane enumeration

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Message-ID: <20101003105500.GA9844@angua.secretlab.ca>
Date:	Sun, 3 Oct 2010 04:55:00 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 16/47] genirq: Implement sane enumeration

On Thu, Sep 30, 2010 at 11:15:51PM -0000, Thomas Gleixner wrote:
> Use the allocator bitmap to lookup active interrupts.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
[...]
> Index: linux-2.6-tip/kernel/irq/irqdesc.c
> ===================================================================
> --- linux-2.6-tip.orig/kernel/irq/irqdesc.c
> +++ linux-2.6-tip/kernel/irq/irqdesc.c
> @@ -470,6 +470,23 @@ err:
>  	return ret;
>  }
>  
> +/**
> + * irq_get_next_irq - get next allocated irq number
> + * @offset:	where to start the search
> + *
> + * Returns next irq number after offset or nr_irqs if none is found.
> + */
> +unsigned int irq_get_next_irq(unsigned int offset)
> +{
> +	unsigned long flags;
> +	unsigned int res;
> +
> +	raw_spin_lock_irqsave(&sparse_irq_lock, flags);
> +	res = find_next_bit_set(allocated_irqs, nr_irqs, offset);
> +	raw_spin_unlock_irqsave(&sparse_irq_lock, flags);
> +	return res;
> +}

Where is the bitmap defined?  I don't see it in the queue; but I also
notice that patch #14 is missing.  Is it defined there?

g.

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