diff -ruN dist-2.4.6/include/linux/ide.h cobalt-2.4.6/include/linux/ide.h
--- dist-2.4.6/include/linux/ide.h	Tue Jul  3 15:44:16 2001
+++ cobalt-2.4.6/include/linux/ide.h	Mon Jul  9 15:56:19 2001
@@ -284,6 +284,7 @@
 	unsigned long service_time;	/* service time of last request */
 	unsigned long timeout;		/* max time to wait for irq */
 	special_t	special;	/* special action flags */
+	void	 *rwproc_cache;		/* last rwproc update */
 	byte     keep_settings;		/* restore settings after drive reset */
 	byte     using_dma;		/* disk is using dma for read/write */
 	byte     waiting_for_dma;	/* dma currently in progress */