diff --git a/drivers/xen/gntdev-common.h b/drivers/xen/gntdev-common.h
index 2f8b949..20d7d05 100644
--- a/drivers/xen/gntdev-common.h
+++ b/drivers/xen/gntdev-common.h
@@ -15,21 +15,15 @@
 #include <linux/mman.h>
 #include <linux/mmu_notifier.h>
 #include <linux/types.h>
+#include <xen/interface/event_channel.h>
 
 struct gntdev_dmabuf_priv;
 
 struct gntdev_priv {
 	/* Maps with visible offsets in the file descriptor. */
 	struct list_head maps;
-	/*
-	 * Maps that are not visible; will be freed on munmap.
-	 * Only populated if populate_freeable_maps == 1
-	 */
-	struct list_head freeable_maps;
 	/* lock protects maps and freeable_maps. */
 	struct mutex lock;
-	struct mm_struct *mm;
-	struct mmu_notifier mn;
 
 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
 	/* Device for which DMA memory is allocated. */
@@ -45,10 +39,11 @@
 	int flags;
 	/* Address relative to the start of the gntdev_grant_map. */
 	int addr;
-	int event;
+	evtchn_port_t event;
 };
 
 struct gntdev_grant_map {
+	struct mmu_interval_notifier notifier;
 	struct list_head next;
 	struct vm_area_struct *vma;
 	int index;
@@ -87,7 +82,7 @@
 
 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
 
-bool gntdev_account_mapped_pages(int count);
+bool gntdev_test_page_count(unsigned int count);
 
 int gntdev_map_grant_pages(struct gntdev_grant_map *map);