diff -urN rwsem/include/linux/rwsem.h rwsem-rec/include/linux/rwsem.h
--- rwsem/include/linux/rwsem.h	Wed Mar  6 05:03:56 2002
+++ rwsem-rec/include/linux/rwsem.h	Wed Mar  6 05:05:36 2002
@@ -18,6 +18,11 @@
 #endif
 };
 
+struct rw_sem_recursor
+{
+	int counter;
+};
+
 #if RWSEM_DEBUG
 #define __SEM_DEBUG_INIT(name) \
 	, (long)&(name).__magic
@@ -42,6 +47,7 @@
 	__SEM_DEBUG_INIT(name)			\
 }
 #define RWSEM_INITIALIZER(name) __RWSEM_INITIALIZER(name, 0)
+#define RWSEM_RECURSOR_INITIALIZER ((struct rw_sem_recursor) { 0, })
 
 #define __DECLARE_RWSEM(name, count) \
 	struct rw_semaphore name = __RWSEM_INITIALIZER(name, count)
@@ -112,6 +118,35 @@
 	spin_lock(&sem->lock);
 	sem->count -= RWSEM_WRITE_BIAS;
 	if (unlikely(sem->count))
+		rwsem_wake(sem);
+	spin_unlock(&sem->lock);
+}
+
+static inline void down_read_recursive(struct rw_semaphore *sem,
+				       struct rw_sem_recursor * recursor)
+{
+	long count;
+	int counter;
+	CHECK_MAGIC(sem->__magic);
+
+	spin_lock(&sem->lock);
+	count = sem->count;
+	sem->count += RWSEM_READ_BIAS;
+	counter = recursor->counter++;
+	if (unlikely(count < 0 && !counter && !(count & RWSEM_READ_MASK)))
+		rwsem_down_failed(sem, RWSEM_READ_BLOCKING_BIAS);
+	spin_unlock(&sem->lock);
+}
+
+static inline void up_read_recursive(struct rw_semaphore *sem,
+				     struct rw_sem_recursor * recursor)
+{
+	CHECK_MAGIC(sem->__magic);
+
+	spin_lock(&sem->lock);
+	sem->count -= RWSEM_READ_BIAS;
+	recursor->counter--;
+	if (unlikely(sem->count < 0 && !(sem->count & RWSEM_READ_MASK)))
 		rwsem_wake(sem);
 	spin_unlock(&sem->lock);
 }