uses the new proc_create function to create /proc entries
instead of create_proc_entry which was deprecated: 
https://lkml.org/lkml/2013/4/11/215

--- a/vmblock-only/linux/control.c	2013-05-21 19:21:19.165750556 +0200
+++ b/vmblock-only/linux/control.c	2013-05-21 19:22:18.363747723 +0200
@@ -208,9 +208,10 @@
    VMBlockSetProcEntryOwner(controlProcMountpoint);
 
    /* Create /proc/fs/vmblock/dev */
-   controlProcEntry = create_proc_entry(VMBLOCK_CONTROL_DEVNAME,
-                                        VMBLOCK_CONTROL_MODE,
-                                        controlProcDirEntry);
+   controlProcEntry = proc_create(VMBLOCK_CONTROL_DEVNAME,
+                                  VMBLOCK_CONTROL_MODE,
+                                  controlProcDirEntry,
+                                  &ControlFileOps);
    if (!controlProcEntry) {
       Warning("SetupProcDevice: could not create " VMBLOCK_DEVICE "\n");
       remove_proc_entry(VMBLOCK_CONTROL_MOUNTPOINT, controlProcDirEntry);
@@ -218,7 +219,6 @@
       return -EINVAL;
    }
 
-   controlProcEntry->proc_fops = &ControlFileOps;
    return 0;
 }