diff -Naur nv.orig/nv.c nv/nv.c
--- nv.orig/nv.c	2015-04-16 12:42:44.787122000 +0200
+++ nv/nv.c	2015-04-16 13:17:17.516780874 +0200
@@ -726,8 +726,13 @@
     unsigned long cr0 = read_cr0();
     write_cr0(((cr0 & (0xdfffffff)) | 0x40000000));
     wbinvd();
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)
+    *cr4 = __read_cr4();
+    if (*cr4 & 0x80) __write_cr4(*cr4 & ~0x80);
+#else
     *cr4 = read_cr4();
     if (*cr4 & 0x80) write_cr4(*cr4 & ~0x80);
+#endif
     __flush_tlb();
 }
 
@@ -737,7 +742,11 @@
     wbinvd();
     __flush_tlb();
     write_cr0((cr0 & 0x9fffffff));
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)
+    if (cr4 & 0x80) __write_cr4(cr4);
+#else
     if (cr4 & 0x80) write_cr4(cr4);
+#endif
 }
 
 static int __determine_pat_mode()