[Xen-changelog] [xen-4.1-testing] x86: fix off-by-one in nr_irqs_gsi calculation

[Xen patchbot-4.1-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1343651938 -3600
# Node ID fa34499e8f6c579d20d18b308c51fc8640b7e0b3
# Parent  9908dc9808b7751f40c6c9174b70cc27842b07ae
x86: fix off-by-one in nr_irqs_gsi calculation

highest_gsi() returns the last valid GSI, not a count.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Joe Jin <joe.jin@xxxxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
xen-unstable changeset:   25688:e6266fc76d08
xen-unstable date:        Fri Jul 27 12:22:13 2012 +0200
---


diff -r 9908dc9808b7 -r fa34499e8f6c xen/arch/x86/io_apic.c
--- a/xen/arch/x86/io_apic.c    Mon Jul 30 13:38:26 2012 +0100
+++ b/xen/arch/x86/io_apic.c    Mon Jul 30 13:38:58 2012 +0100
@@ -2665,7 +2665,7 @@ void __init init_ioapic_mappings(void)
         }
     }
 
-    nr_irqs_gsi = max(nr_irqs_gsi, highest_gsi());
+    nr_irqs_gsi = max(nr_irqs_gsi, highest_gsi() + 1);
 
     if ( max_gsi_irqs == 0 )
         max_gsi_irqs = nr_irqs ? nr_irqs / 8 : PAGE_SIZE;

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