diff --git a/include/linux/hpet.h b/include/linux/hpet.h
index 2723819..707f7cb 100644
--- a/include/linux/hpet.h
+++ b/include/linux/hpet.h
@@ -3,6 +3,8 @@
 
 #include <linux/compiler.h>
 
+#ifdef __KERNEL__
+
 /*
  * Offsets into HPET Registers
  */
@@ -85,22 +87,6 @@
 #define	Tn_FSB_INT_ADDR_SHIFT		(32UL)
 #define	Tn_FSB_INT_VAL_MASK		(0x00000000ffffffffULL)
 
-struct hpet_info {
-	unsigned long hi_ireqfreq;	/* Hz */
-	unsigned long hi_flags;	/* information */
-	unsigned short hi_hpet;
-	unsigned short hi_timer;
-};
-
-#define	HPET_INFO_PERIODIC	0x0001	/* timer is periodic */
-
-#define	HPET_IE_ON	_IO('h', 0x01)	/* interrupt on */
-#define	HPET_IE_OFF	_IO('h', 0x02)	/* interrupt off */
-#define	HPET_INFO	_IOR('h', 0x03, struct hpet_info)
-#define	HPET_EPI	_IO('h', 0x04)	/* enable periodic */
-#define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */
-#define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */
-
 /*
  * exported interfaces
  */
@@ -133,4 +119,22 @@
 int hpet_unregister(struct hpet_task *);
 int hpet_control(struct hpet_task *, unsigned int, unsigned long);
 
+#endif /* __KERNEL__ */
+
+struct hpet_info {
+	unsigned long hi_ireqfreq;	/* Hz */
+	unsigned long hi_flags;	/* information */
+	unsigned short hi_hpet;
+	unsigned short hi_timer;
+};
+
+#define	HPET_INFO_PERIODIC	0x0001	/* timer is periodic */
+
+#define	HPET_IE_ON	_IO('h', 0x01)	/* interrupt on */
+#define	HPET_IE_OFF	_IO('h', 0x02)	/* interrupt off */
+#define	HPET_INFO	_IOR('h', 0x03, struct hpet_info)
+#define	HPET_EPI	_IO('h', 0x04)	/* enable periodic */
+#define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */
+#define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */
+
 #endif				/* !__HPET__ */