diff -ru ../../REF/2.4.17-ia64-011226/arch/ia64/kernel/irq.c linux/arch/ia64/kernel/irq.c
--- ../../REF/2.4.17-ia64-011226/arch/ia64/kernel/irq.c	Mon Dec 31 09:02:35 2001
+++ linux/arch/ia64/kernel/irq.c	Fri Jan  4 16:17:35 2002
@@ -1010,6 +1010,11 @@
 		rand_initialize_irq(irq);
 	}
 
+	if (new->flags & SA_PERCPU_IRQ) {
+		desc->status |= IRQ_PER_CPU;
+		desc->handler = &irq_type_ia64_lsapic;
+	}
+
 	/*
 	 * The following block of code has to be executed atomically
 	 */
diff -ru ../../REF/2.4.17-ia64-011226/include/asm-ia64/signal.h linux/include/asm-ia64/signal.h
--- ../../REF/2.4.17-ia64-011226/include/asm-ia64/signal.h	Wed Oct  3 11:32:32 2001
+++ linux/include/asm-ia64/signal.h	Fri Jan  4 16:23:52 2002
@@ -111,10 +111,12 @@
  *
  * SA_INTERRUPT is also used by the irq handling routines.
  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
+ * SA_PERCPU_IRQ is for processor internal interrupts
  */
 #define SA_PROBE		SA_ONESHOT
 #define SA_SAMPLE_RANDOM	SA_RESTART
 #define SA_SHIRQ		0x04000000
+#define SA_PERCPU_IRQ		0x02000000
 
 #endif /* __KERNEL__ */