[PATCH] ia64: don't try to synchronize ITCs on ITC_DRIFT platforms

A small patch for 2.4 that stops the kernel from trying to syncrhonize
ITC clocks between CPUs if we know that the ITC isn't synchronized
across the backplane.

arch/ia64/kernel/smpboot.c

@@ -279,12 +279,15 @@ smp_callin (void)
 
 	smp_setup_percpu_timer();
 
+	if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) {
 		/*
 		 * Synchronize the ITC with the BP
 		 */
 		Dprintk("Going to syncup ITC with BP.\n");
 
 		ia64_sync_itc(0);
+	}
+
 	/*
 	 * Get our bogomips.
 	 */