Re: [Xen-devel] Re: CONFIG_SPARSE_IRQ breaks single VCPU domain 0 between xen/master and xen/next

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2010-03-01 at 17:47 +0000, Konrad Rzeszutek Wilk wrote: 
> On Mon, Mar 01, 2010 at 10:33:17AM +0000, Ian Campbell wrote:
> > On Sun, 2010-02-28 at 12:01 +0000, Erik Brakkee wrote:
> > > Ian Campbell <Ian.Campbell <at> citrix.com> writes:
> > > 
> > > > 
> > > > With a single VCPU domain 0 (either due to hardware on dom0_max_vcpus=1)
> > > > and CONFIG_SPARSE_IRQ on xen/next I see:
> > > > 
> > > >         Kernel panic - not syncing: No available IRQ to bind to: 
> > > > increase
> > > nr_irqs! (currently 256, started from 256)
> > > > 
> > > 
> > > 
> > > The strange thing is that the kernel panic at boot also appears with 
> > > xen/master
> > > now. I am using the .config from
> > > http://wiki.xensource.com/xenwiki/XenParavirtOps. This behavior is 
> > > occurring on
> > > a Sony Vaio F11 laptop (Core i7 720QM, 8GB memory).
> > > 
> > > Is there a simple workaround for this problem?
> > 
> > I think the xen/master case is actually down to my "fix off-by-one error
> > in find_unbound_irq" change -- should probably be reverted.
> 
> Shouldn't your other patch, the one that inserts the
> 
> if (start == nr_irqs) goto out;
> 
> be added instead?

Yes, I hadn't written it when I wrote the above.

Ian.


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