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[Xen-devel] [PATCH 16/17] xen: fix legacy irq setup, make ioapic-less ma

To: "H. Peter Anvin" <hpa@xxxxxxxxx>
Subject: [Xen-devel] [PATCH 16/17] xen: fix legacy irq setup, make ioapic-less machines work.
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 13 Mar 2009 09:42:37 -0700
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
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From: Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>
 arch/x86/xen/pci.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
index fb3ada9..69b475b 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -65,6 +65,12 @@ void __init xen_setup_pirqs(void)
        int irq;
+       if (0 == nr_ioapics) {
+               for (irq=0; irq < NR_IRQS_LEGACY; irq++)
+                       xen_allocate_pirq(irq, "xt-pic");
+               return;
+       }
        /* Pre-allocate legacy irqs */
        for (irq=0; irq < NR_IRQS_LEGACY; irq++) {
                int trigger, polarity;

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