diff -urN linux-2.6.1/include/linux/spinlock.h linux-2.6.1-rwlock-patch/include/linux/spinlock.h
--- linux-2.6.1/include/linux/spinlock.h	2004-01-09 12:29:33.000000000 +0530
+++ linux-2.6.1-rwlock-patch/include/linux/spinlock.h	2004-01-16 18:15:10.000000000 +0530
@@ -176,6 +176,7 @@
 #endif
 
 #define rwlock_init(lock)	do { (void)(lock); } while(0)
+#define rwlock_is_locked(lock)  ((void)(lock), 0)
 #define _raw_read_lock(lock)	do { (void)(lock); } while(0)
 #define _raw_read_unlock(lock)	do { (void)(lock); } while(0)
 #define _raw_write_lock(lock)	do { (void)(lock); } while(0)