diff -urN 2.4.10pre2/arch/i386/kernel/smp.c mb/arch/i386/kernel/smp.c
--- 2.4.10pre2/arch/i386/kernel/smp.c	Thu Aug 16 22:03:24 2001
+++ mb/arch/i386/kernel/smp.c	Thu Aug 30 21:31:09 2001
@@ -468,6 +468,7 @@
 
 	spin_lock_bh(&call_lock);
 	call_data = &data;
+	wmb();
 	/* Send a message to all other CPUs and wait for them to respond */
 	send_IPI_allbutself(CALL_FUNCTION_VECTOR);
 
@@ -531,12 +532,15 @@
 	 * Notify initiating CPU that I've grabbed the data and am
 	 * about to execute the function
 	 */
+	mb();
 	atomic_inc(&call_data->started);
 	/*
 	 * At this point the info structure may be out of scope unless wait==1
 	 */
 	(*func)(info);
-	if (wait)
+	if (wait) {
+		mb();
 		atomic_inc(&call_data->finished);
+	}
 }