diff -urN 2.4.6pre2/include/linux/interrupt.h softirq-smp-fixes/include/linux/interrupt.h
--- 2.4.6pre2/include/linux/interrupt.h	Sat Jun  9 00:04:49 2001
+++ softirq-smp-fixes/include/linux/interrupt.h	Mon Jun 11 18:54:42 2001
@@ -138,22 +138,26 @@
 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 {
 	atomic_inc(&t->count);
+	smp_mb__after_atomic_inc();
 }
 
 static inline void tasklet_disable(struct tasklet_struct *t)
 {
 	tasklet_disable_nosync(t);
 	tasklet_unlock_wait(t);
+	smp_mb();
 }
 
 static inline void tasklet_enable(struct tasklet_struct *t)
 {
+	smp_mb__before_atomic_dec();
 	if (atomic_dec_and_test(&t->count))
 		tasklet_schedule(t);
 }
 
 static inline void tasklet_hi_enable(struct tasklet_struct *t)
 {
+	smp_mb__before_atomic_dec();
 	if (atomic_dec_and_test(&t->count))
 		tasklet_hi_schedule(t);
 }