--- 2.4.0-test7-pre5/include/linux/brlock.h	Tue Aug 22 01:30:04 2000
+++ /tmp/brlock.h	Tue Aug 22 01:56:53 2000
@@ -114,10 +114,15 @@
 	lock = &__br_write_locks[idx].lock;
 again:
 	(*ctr)++;
-	rmb();
+	mb();
 	if (spin_is_locked(lock)) {
 		(*ctr)--;
-		rmb();
+		wmb(); /*
+			* The release of the ctr must become visible
+			* to the other cpus eventually thus wmb(),
+			* we don't care if spin_is_locked is reordered
+			* before the releasing of the ctr.
+			*/
 		while (spin_is_locked(lock))
 			barrier();
 		goto again;