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Re: [Xen-devel] Kernel pv_ops freeze on start, No available IRQ

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Subject: Re: [Xen-devel] Kernel pv_ops freeze on start, No available IRQ to bind to, increase nr_irqs!
From: Fantu <fantonifabio@xxxxxxxxxx>
Date: Mon, 1 Mar 2010 07:34:41 -0800 (PST)
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I have try xen/master with CONFIG_SPARSE_IRQ=n and reverse of your patch but
nothing, after i try xen/stable with CONFIG_SPARSE_IRQ=n and apply patch
0001-x86-ioapic-Remove-the-hack-for-calculating-nr_irq_ from another post
and work... finally xen 4 with kernel pv_ops work on  Dell T610 :jumping:

Ian Campbell-10 wrote:
> On Mon, 2010-03-01 at 10:45 +0000, Fantu wrote:
>> i have problem more before...
>> CONFIG_SPARSE_IRQ=y on all .config i have used, i can change to n and try
>> or
>> must set to y?
> Try reverting this first:
> commit 68458a366412dbbfa726dbdd403e94be5ac10a69
> Author: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Date:   Fri Feb 26 10:59:35 2010 +0000
>     xen: fix off-by-one error in find_unbound_irq
>     e459de95 "Find an unbound irq number in reverse order (high to low)"
> introduced
>     an off by one error which would cause repeated allocations of the
> nr_irq'th IRQ
>     if there are no spare interrupts (i.e. get_nr_hw_irqs() == nr_irqs).
>     Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
>     Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>     Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
>     Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> If that doesn't help then try setting CONFIG_SPARSE_IRQ to n.
> Ian.

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