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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: Fri, 5 Mar 2010 02:30:02 -0800 (PST)
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i have recompile on xen/master updated (necessary for gfx test) but not work
now i try with CONFIG_SPARSE_IRQ=n
the config use is:  http://old.nabble.com/file/p27792293/.config .config 

Zhang, Xiantao wrote:
> Fantu wrote:
>> 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:  
> Have you tried CONFIG_SPARSE_IRQ=y with this patch ?  I think it should
> work as well. 
> Xiantao 
>> 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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