From a49147f3b26ae6b5f6a7ea886628926b01c00b43 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Mon, 30 Jul 2012 13:39:47 +0100 Subject: 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 Acked-by: Joe Jin Acked-by: Keir Fraser xen-unstable changeset: 25688:e6266fc76d08 xen-unstable date: Fri Jul 27 12:22:13 2012 +0200 --- xen/arch/x86/io_apic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c index ea627672af..842e4cf21d 100644 --- a/xen/arch/x86/io_apic.c +++ b/xen/arch/x86/io_apic.c @@ -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; -- cgit v1.2.3