[Xen-changelog] [xen-4.0-testing] x86: fix off-by-one in nr_irqs_gsi calculation

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1343651987 -3600
# Node ID 6d7ae840463c5d6d15c710199b3f4b2bb2a33000
# Parent  58516d1a539e166e20472ade13bdef6b4ed016fa
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 58516d1a539e -r 6d7ae840463c xen/arch/x86/io_apic.c
--- a/xen/arch/x86/io_apic.c    Mon Jul 30 13:39:31 2012 +0100
+++ b/xen/arch/x86/io_apic.c    Mon Jul 30 13:39:47 2012 +0100
@@ -2589,7 +2589,7 @@ 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 ( !smp_found_config || skip_ioapic_setup || nr_irqs_gsi < 16 )
         nr_irqs_gsi = 16;

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