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Subject: Re: 2.5.68-mmX: Drowning in irq 7: nobody cared!
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andrew Morton <akpm@digeo.com>
Cc: Shane Shrybman <shrybman@sympatico.ca>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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	 <20030505143006.29c0301a.akpm@digeo.com>
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On Llu, 2003-05-05 at 22:30, Andrew Morton wrote:
> Shane Shrybman <shrybman@sympatico.ca> wrote:
> >
> > Hi,
> > 
> > I am getting a lot of these in the logs. This is with the ALSA emu10k1
> > driver for a SB live card. This is a x86, UP, KT133 system with preempt
> > enabled. The system seems to be running fine.
> > 
> > handlers:
> > [<d8986540>] (gcc2_compiled.+0x0/0x390 [snd_emu10k1])
> > irq 7: nobody cared!
> 
> Beats me.  Does this fix it up?

With APIC at least it doesnt suprise me the least. The IRQ hack seems
extremely racey. Remember on most systems (especially with PIII type
APIC) IRQ delivery is asynchronous to the bus so you get

IRQ arrives
			sound card
			loop
				clean up IRQ
IRQ sent
				still more work, do it
			done
			HANDLED

IRQ arrives
			sound card
			Umm duh no work for me
			NOT HANDLED

		Whine

For anything where you get pairs of close IRQ's

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