diff -Naur linux-2.3.23-org/arch/i386/kernel/time.c linux-2.3.23/arch/i386/kernel/time.c
--- linux-2.3.23-org/arch/i386/kernel/time.c	2007-10-26 19:16:38.000000000 +0530
+++ linux-2.3.23/arch/i386/kernel/time.c	2007-10-26 19:17:49.000000000 +0530
@@ -150,6 +150,10 @@
 }
 EXPORT_SYMBOL(profile_pc);
 
+/* Interrupt latency pointer */
+irqlatptr irq_lat_ptr = NULL;
+EXPORT_SYMBOL(irq_lat_ptr);
+
 /*
  * This is the same as the above, except we _also_ save the current
  * Time Stamp Counter value at the time of the timer interrupt, so that
@@ -173,6 +177,10 @@
 	}
 #endif
 
+	/* Interrupt latency pointer */
+	if (irq_lat_ptr)
+		irq_lat_ptr();
+
 	do_timer_interrupt_hook();
 
 	if (MCA_bus) {
diff -Naur linux-2.3.23-org/include/asm-i386/time.h linux-2.3.23/include/asm-i386/time.h
--- linux-2.3.23-org/include/asm-i386/time.h	2007-10-26 19:16:38.000000000 +0530
+++ linux-2.3.23/include/asm-i386/time.h	2007-10-26 19:18:10.000000000 +0530
@@ -28,6 +28,10 @@
 	return retval;
 }
 
+/* interrupt latency pointer */
+typedef void (*irqlatptr)(void);
+extern irqlatptr irq_lat_ptr;
+
 extern void (*late_time_init)(void);
 extern void hpet_time_init(void);