diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index 42e978e..3d02385 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -147,20 +147,11 @@
 static void pci_event_handler(struct HvLpEvent *event, struct pt_regs *regs)
 {
 	if (event && (event->xType == HvLpEvent_Type_PciIo)) {
-		switch (event->xFlags.xFunction) {
-		case HvLpEvent_Function_Int:
+		if (hvlpevent_is_int(event))
 			int_received((struct pci_event *)event, regs);
-			break;
-		case HvLpEvent_Function_Ack:
+		else
 			printk(KERN_ERR
 				"pci_event_handler: unexpected ack received\n");
-			break;
-		default:
-			printk(KERN_ERR
-				"pci_event_handler: unexpected event function %d\n",
-				(int)event->xFlags.xFunction);
-			break;
-		}
 	} else if (event)
 		printk(KERN_ERR
 			"pci_event_handler: Unrecognized PCI event type 0x%x\n",
diff --git a/arch/powerpc/platforms/iseries/lpevents.c b/arch/powerpc/platforms/iseries/lpevents.c
index e9fb98b..0b88530 100644
--- a/arch/powerpc/platforms/iseries/lpevents.c
+++ b/arch/powerpc/platforms/iseries/lpevents.c
@@ -53,7 +53,7 @@
 	struct HvLpEvent * event;
 	event = (struct HvLpEvent *)hvlpevent_queue.xSlicCurEventPtr;
 
-	if (event->xFlags.xValid) {
+	if (hvlpevent_is_valid(event)) {
 		/* rmb() needed only for weakly consistent machines (regatta) */
 		rmb();
 		/* Set pointer to next potential event */
@@ -84,7 +84,7 @@
 
 	next_event = (struct HvLpEvent *)hvlpevent_queue.xSlicCurEventPtr;
 
-	return next_event->xFlags.xValid |
+	return hvlpevent_is_valid(next_event) ||
 		hvlpevent_queue.xPlicOverflowIntPending;
 }
 
@@ -101,18 +101,18 @@
 	switch (extra) {
 	case 3:
 		tmp = (struct HvLpEvent*)((char*)event + 3 * LpEventAlign);
-		tmp->xFlags.xValid = 0;
+		hvlpevent_invalidate(tmp);
 	case 2:
 		tmp = (struct HvLpEvent*)((char*)event + 2 * LpEventAlign);
-		tmp->xFlags.xValid = 0;
+		hvlpevent_invalidate(tmp);
 	case 1:
 		tmp = (struct HvLpEvent*)((char*)event + 1 * LpEventAlign);
-		tmp->xFlags.xValid = 0;
+		hvlpevent_invalidate(tmp);
 	}
 
 	mb();
 
-	event->xFlags.xValid = 0;
+	hvlpevent_invalidate(event);
 }
 
 void process_hvlpevents(struct pt_regs *regs)
diff --git a/arch/powerpc/platforms/iseries/mf.c b/arch/powerpc/platforms/iseries/mf.c
index 49e7e4b..a41d8b7 100644
--- a/arch/powerpc/platforms/iseries/mf.c
+++ b/arch/powerpc/platforms/iseries/mf.c
@@ -251,10 +251,7 @@
 	}
 	memset(ev, 0, sizeof(struct pending_event));
 	hev = &ev->event.hp_lp_event;
-	hev->xFlags.xValid = 1;
-	hev->xFlags.xAckType = HvLpEvent_AckType_ImmediateAck;
-	hev->xFlags.xAckInd = HvLpEvent_AckInd_DoAck;
-	hev->xFlags.xFunction = HvLpEvent_Function_Int;
+	hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK | HV_LP_EVENT_INT;
 	hev->xType = HvLpEvent_Type_MachineFac;
 	hev->xSourceLp = HvLpConfig_getLpIndex();
 	hev->xTargetLp = primary_lp;
@@ -518,17 +515,10 @@
 static void hv_handler(struct HvLpEvent *event, struct pt_regs *regs)
 {
 	if ((event != NULL) && (event->xType == HvLpEvent_Type_MachineFac)) {
-		switch(event->xFlags.xFunction) {
-		case HvLpEvent_Function_Ack:
+		if (hvlpevent_is_ack(event))
 			handle_ack((struct io_mf_lp_event *)event);
-			break;
-		case HvLpEvent_Function_Int:
+		else
 			handle_int((struct io_mf_lp_event *)event);
-			break;
-		default:
-			printk(KERN_ERR "mf.c: non ack/int event received\n");
-			break;
-		}
 	} else
 		printk(KERN_ERR "mf.c: alien event received\n");
 }
diff --git a/arch/powerpc/platforms/iseries/viopath.c b/arch/powerpc/platforms/iseries/viopath.c
index 84267269..622a301 100644
--- a/arch/powerpc/platforms/iseries/viopath.c
+++ b/arch/powerpc/platforms/iseries/viopath.c
@@ -270,7 +270,7 @@
 	 * First see if this is just a normal monitor message from the
 	 * other partition
 	 */
-	if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
+	if (hvlpevent_is_int(event)) {
 		remoteLp = event->xSourceLp;
 		if (!viopathStatus[remoteLp].isActive)
 			sendMonMsg(remoteLp);
@@ -331,13 +331,12 @@
 {
 	if (!event)
 		return;
-	if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
+	if (hvlpevent_is_int(event)) {
 		printk(VIOPATH_KERN_WARN
 		       "unexpected config request from partition %d",
 		       event->xSourceLp);
 
-		if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
-		    (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
+		if (hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
@@ -377,7 +376,7 @@
 	int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK)
 		>> VIOMAJOR_SUBTYPE_SHIFT;
 
-	if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
+	if (hvlpevent_is_int(event)) {
 		remoteLp = event->xSourceLp;
 		/*
 		 * The isActive is checked because if the hosting partition
@@ -436,8 +435,7 @@
 		       "unexpected virtual io event subtype %d from partition %d\n",
 		       event->xSubtype, remoteLp);
 		/* No handler.  Ack if necessary */
-		if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
-		    (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
+		if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index d1aaf31..f63e07b 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -293,6 +293,7 @@
 	u16 viocmd;
 	HvLpEvent_Rc hvrc;
 	struct vioblocklpevent *bevent;
+	struct HvLpEvent *hev;
 	struct scatterlist sg[VIOMAXBLOCKDMA];
 	int sgindex;
 	int statindex;
@@ -347,22 +348,19 @@
 		 * token so we can match the response up later
 		 */
 		memset(bevent, 0, sizeof(struct vioblocklpevent));
-		bevent->event.xFlags.xValid = 1;
-		bevent->event.xFlags.xFunction = HvLpEvent_Function_Int;
-		bevent->event.xFlags.xAckInd = HvLpEvent_AckInd_DoAck;
-		bevent->event.xFlags.xAckType = HvLpEvent_AckType_ImmediateAck;
-		bevent->event.xType = HvLpEvent_Type_VirtualIo;
-		bevent->event.xSubtype = viocmd;
-		bevent->event.xSourceLp = HvLpConfig_getLpIndex();
-		bevent->event.xTargetLp = viopath_hostLp;
-		bevent->event.xSizeMinus1 =
+		hev = &bevent->event;
+		hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK |
+			HV_LP_EVENT_INT;
+		hev->xType = HvLpEvent_Type_VirtualIo;
+		hev->xSubtype = viocmd;
+		hev->xSourceLp = HvLpConfig_getLpIndex();
+		hev->xTargetLp = viopath_hostLp;
+		hev->xSizeMinus1 =
 			offsetof(struct vioblocklpevent, u.rw_data.dma_info) +
 			(sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1;
-		bevent->event.xSourceInstanceId =
-			viopath_sourceinst(viopath_hostLp);
-		bevent->event.xTargetInstanceId =
-			viopath_targetinst(viopath_hostLp);
-		bevent->event.xCorrelationToken = (u64)req;
+		hev->xSourceInstanceId = viopath_sourceinst(viopath_hostLp);
+		hev->xTargetInstanceId = viopath_targetinst(viopath_hostLp);
+		hev->xCorrelationToken = (u64)req;
 		bevent->version = VIOVERSION;
 		bevent->disk = DEVICE_NO(d);
 		bevent->u.rw_data.offset = start;
@@ -649,10 +647,10 @@
 		/* Notification that a partition went away! */
 		return;
 	/* First, we should NEVER get an int here...only acks */
-	if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
+	if (hvlpevent_is_int(event)) {
 		printk(VIOD_KERN_WARNING
 		       "Yikes! got an int in viodasd event handler!\n");
-		if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
+		if (hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
@@ -695,7 +693,7 @@
 
 	default:
 		printk(VIOD_KERN_WARNING "invalid subtype!");
-		if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
+		if (hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index b519178..193446e 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -542,10 +542,10 @@
 		/* Notification that a partition went away! */
 		return;
 	/* First, we should NEVER get an int here...only acks */
-	if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
+	if (hvlpevent_is_int(event)) {
 		printk(VIOCD_KERN_WARNING
 				"Yikes! got an int in viocd event handler!\n");
-		if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
+		if (hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
@@ -616,7 +616,7 @@
 		printk(VIOCD_KERN_WARNING
 				"message with invalid subtype %0x04X!\n",
 				event->xSubtype & VIOMINOR_SUBTYPE_MASK);
-		if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
+		if (hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
diff --git a/drivers/char/viocons.c b/drivers/char/viocons.c
index faee5e7..4e53603 100644
--- a/drivers/char/viocons.c
+++ b/drivers/char/viocons.c
@@ -476,19 +476,19 @@
  */
 static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp)
 {
+	struct HvLpEvent *hev = &viochar->event;
+
 	memset(viochar, 0, sizeof(struct viocharlpevent));
 
-	viochar->event.xFlags.xValid = 1;
-	viochar->event.xFlags.xFunction = HvLpEvent_Function_Int;
-	viochar->event.xFlags.xAckInd = HvLpEvent_AckInd_NoAck;
-	viochar->event.xFlags.xAckType = HvLpEvent_AckType_DeferredAck;
-	viochar->event.xType = HvLpEvent_Type_VirtualIo;
-	viochar->event.xSubtype = viomajorsubtype_chario | viochardata;
-	viochar->event.xSourceLp = HvLpConfig_getLpIndex();
-	viochar->event.xTargetLp = lp;
-	viochar->event.xSizeMinus1 = sizeof(struct viocharlpevent);
-	viochar->event.xSourceInstanceId = viopath_sourceinst(lp);
-	viochar->event.xTargetInstanceId = viopath_targetinst(lp);
+	hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |
+		HV_LP_EVENT_INT;
+	hev->xType = HvLpEvent_Type_VirtualIo;
+	hev->xSubtype = viomajorsubtype_chario | viochardata;
+	hev->xSourceLp = HvLpConfig_getLpIndex();
+	hev->xTargetLp = lp;
+	hev->xSizeMinus1 = sizeof(struct viocharlpevent);
+	hev->xSourceInstanceId = viopath_sourceinst(lp);
+	hev->xTargetInstanceId = viopath_targetinst(lp);
 }
 
 /*
@@ -752,7 +752,7 @@
 	struct port_info *pi;
 	int reject = 0;
 
-	if (event->xFlags.xFunction == HvLpEvent_Function_Ack) {
+	if (hvlpevent_is_ack(event)) {
 		if (port >= VTTY_PORTS)
 			return;
 
@@ -788,7 +788,7 @@
 	}
 
 	/* This had better require an ack, otherwise complain */
-	if (event->xFlags.xAckInd != HvLpEvent_AckInd_DoAck) {
+	if (!hvlpevent_need_ack(event)) {
 		printk(VIOCONS_KERN_WARN "viocharopen without ack bit!\n");
 		return;
 	}
@@ -856,7 +856,7 @@
 	struct viocharlpevent *cevent = (struct viocharlpevent *)event;
 	u8 port = cevent->virtual_device;
 
-	if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
+	if (hvlpevent_is_int(event)) {
 		if (port >= VTTY_PORTS) {
 			printk(VIOCONS_KERN_WARN
 					"close message from invalid virtual device.\n");
@@ -1056,8 +1056,7 @@
 		vioHandleConfig(event);
 		break;
 	default:
-		if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
-		    (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
+		if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
 			event->xRc = HvLpEvent_Rc_InvalidSubtype;
 			HvCallEvent_ackLpEvent(event);
 		}
diff --git a/drivers/net/iseries_veth.c b/drivers/net/iseries_veth.c
index 77eadf8..f0f04be 100644
--- a/drivers/net/iseries_veth.c
+++ b/drivers/net/iseries_veth.c
@@ -590,9 +590,9 @@
 {
 	struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
 
-	if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
+	if (hvlpevent_is_ack(event))
 		veth_handle_ack(veth_event);
-	else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
+	else
 		veth_handle_int(veth_event);
 }
 
diff --git a/include/asm-powerpc/iseries/hv_lp_event.h b/include/asm-powerpc/iseries/hv_lp_event.h
index 499ab1a..8ee89b6 100644
--- a/include/asm-powerpc/iseries/hv_lp_event.h
+++ b/include/asm-powerpc/iseries/hv_lp_event.h
@@ -32,17 +32,8 @@
  * partitions through PLIC.
  */
 
-struct HvEventFlags {
-	u8	xValid:1;	/* Indicates a valid request	x00-x00 */
-	u8	xRsvd1:4;	/* Reserved			... */
-	u8	xAckType:1;	/* Immediate or deferred	... */
-	u8	xAckInd:1;	/* Indicates if ACK required	... */
-	u8	xFunction:1;	/* Interrupt or Acknowledge	... */
-};
-
-
 struct HvLpEvent {
-	struct HvEventFlags xFlags;	/* Event flags		      x00-x00 */
+	u8	flags;			/* Event flags		      x00-x00 */
 	u8	xType;			/* Type of message	      x01-x01 */
 	u16	xSubtype;		/* Subtype for event	      x02-x03 */
 	u8	xSourceLp;		/* Source LP		      x04-x04 */
@@ -126,6 +117,11 @@
 #define HvLpEvent_AckType_ImmediateAck 0
 #define HvLpEvent_AckType_DeferredAck 1
 
+#define HV_LP_EVENT_INT			0x01
+#define HV_LP_EVENT_DO_ACK		0x02
+#define HV_LP_EVENT_DEFERRED_ACK	0x04
+#define HV_LP_EVENT_VALID		0x80
+
 #define HvLpDma_Direction_LocalToRemote 0
 #define HvLpDma_Direction_RemoteToLocal 1
 
@@ -139,4 +135,29 @@
 #define HvLpDma_Rc_InvalidAddress 4
 #define HvLpDma_Rc_InvalidLength 5
 
+static inline int hvlpevent_is_valid(struct HvLpEvent *h)
+{
+	return h->flags & HV_LP_EVENT_VALID;
+}
+
+static inline void hvlpevent_invalidate(struct HvLpEvent *h)
+{
+	h->flags &= ~ HV_LP_EVENT_VALID;
+}
+
+static inline int hvlpevent_is_int(struct HvLpEvent *h)
+{
+	return h->flags & HV_LP_EVENT_INT;
+}
+
+static inline int hvlpevent_is_ack(struct HvLpEvent *h)
+{
+	return !hvlpevent_is_int(h);
+}
+
+static inline int hvlpevent_need_ack(struct HvLpEvent *h)
+{
+	return h->flags & HV_LP_EVENT_DO_ACK;
+}
+
 #endif /* _ASM_POWERPC_ISERIES_HV_LP_EVENT_H */