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diff --git a/include/asm-x86/rwlock_64.h b/include/asm-x86/rwlock_64.h
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+/* include/asm-x86_64/rwlock.h
+ *
+ * Helpers used by both rw spinlocks and rw semaphores.
+ *
+ * Based in part on code from semaphore.h and
+ * spinlock.h Copyright 1996 Linus Torvalds.
+ *
+ * Copyright 1999 Red Hat, Inc.
+ * Copyright 2001,2002 SuSE labs
+ *
+ * Written by Benjamin LaHaise.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _ASM_X86_64_RWLOCK_H
+#define _ASM_X86_64_RWLOCK_H
+
+#define RW_LOCK_BIAS 0x01000000
+#define RW_LOCK_BIAS_STR "0x01000000"
+
+/* Actual code is in asm/spinlock.h or in arch/x86_64/lib/rwlock.S */
+
+#endif