From 62a2e72600271b2426c7198abb4165a3703cf8a6 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Fri, 27 Jul 2012 12:22:13 +0200 Subject: [PATCH] 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/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 d213f2c388..85191e0af2 100644 --- a/xen/arch/x86/io_apic.c +++ b/xen/arch/x86/io_apic.c @@ -2531,7 +2531,7 @@ 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; -- 2.30.2