diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 217e14b..54733d5 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -977,6 +977,11 @@
 					 const char *mod_name);
 void vmbus_driver_unregister(struct hv_driver *hv_driver);
 
+int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
+			resource_size_t min, resource_size_t max,
+			resource_size_t size, resource_size_t align,
+			bool fb_overlap_ok);
+
 /**
  * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
  *
@@ -1233,8 +1238,6 @@
 
 void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid);
 
-extern struct resource *hyperv_mmio;
-
 /*
  * Negotiated version with the Host.
  */