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

To: Ingo Molnar <mingo@xxxxxxx>
Subject: [Xen-devel] [PATCH 16/17] xen: fix legacy irq setup, make ioapic-less machines work.
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 27 May 2009 00:37:29 -0700
Cc: Chris Wright <chrisw@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ky Srinivasan <ksrinivasan@xxxxxxxxxx>, kurt.hackel@xxxxxxxxxx, the arch/x86 maintainers <x86@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Jens Axboe <jens.axboe@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Greg KH <gregkh@xxxxxxx>
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From: Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>

If the machine has no IO APICs, then just allocate a set of legacy
interrupts.

[ Impact: fix Xen compatibility with old machines ]

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 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 4b286f1..07b59fe 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -66,6 +66,12 @@ 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;
-- 
1.6.0.6


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