1 files changed, 3 insertions, 0 deletions

diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
index 99d7f278612a..cb96b4ea7df6 100644
--- a/arch/ia64/sn/kernel/io_acpi_init.c
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -223,6 +223,9 @@ sn_io_acpi_init(void)
         u64 result;
         s64 status;
 
+        /* SN Altix does not follow the IOSAPIC IRQ routing model */
+        acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+
         acpi_bus_register_driver(&acpi_sn_hubdev_driver);
         status = sal_ioif_init(&result);
         if (status || result)