Re: CONFIG_SPARSE_IRQ breaks single VCPU domain 0 between xen/master and xen/next

[Thomas Schwinge <thomas@schwinge.name>]

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Hello!

Ian, thanks for pointing me to this patch:

On Mon, Mar 01, 2010 at 11:27:17AM +0000, Ian Campbell wrote:
> >From 6d4a9168207ade237098a401270959ecc0bdd1e9 Mon Sep 17 00:00:00 2001
> From: Ian Campbell <ian.campbell@citrix.com>
> Date: Mon, 1 Mar 2010 11:21:15 +0000
> Subject: [PATCH] xen: allow some overhead in IRQ space for dynamic IRQs
>  such as VIRQs and backend event channels.
> 
> This is an interim solution until x86 interrupts become totally dynamic.
> 
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
> ---
>  arch/x86/include/asm/irq_vectors.h |   14 +++++++++++---
>  arch/x86/kernel/apic/io_apic.c     |    4 ++++
>  arch/x86/xen/enlighten.c           |    4 ++++
>  3 files changed, 19 insertions(+), 3 deletions(-)

This patch fixes the issue (``No available IRQ to bind to: increase
nr_irqs!'') that I reported in
<http://lists.debian.org/debian-kernel/2010/03/msg00665.html>, thus feel
free to add ``Tested-by: Thomas Schwinge <thomas@schwinge.name>''.

I put this one commit on top of whatever Debian's
linux-image-2.6.32-4-xen-amd64 2.6.32-10 package has, and am now running
that one on my AMD Sempron system: uni-processor, no hardware
virtualization.


Regards,
 Thomas

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