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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: PCI PM: Restore standard config registers of all devices early
Date: Tue, 3 Feb 2009 23:09:01 +0100
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Jesse Barnes <jesse.barnes@intel.com>, Andreas Schwab <schwab@suse.de>,
       Len Brown <lenb@kernel.org>
References: <200901261904.n0QJ4Q9c016709@hera.kernel.org> <alpine.LFD.2.00.0902021343280.3247@localhost.localdomain> <20090202234923.GA7499@elte.hu>
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On Tuesday 03 February 2009, Ingo Molnar wrote:
> 
> * Linus Torvalds <torvalds@linux-foundation.org> wrote:
> 
> > Ingo: how do we walk over all the interrupt descriptors in todays world? 
> > The whole sparse-vs-nonsparse makes things a bit more complex.
> 
> this:
> 
>         struct irq_desc *desc;
>         int irq;
> 
>         for_each_irq_desc(i, desc) {
> 	...
> 	}
> 
> should do the trick.

So, what do I do in the loop to disable irqs for all devices on the IOAPIC
level.  Would disable_irq(irq) be sufficient?

Also, how can I skip the timer interrupt (we don't want to disable that)?

Rafael