diff -r a5c4ccc02285 -r 5d21d80777a6 lib/master.c
--- a/lib/master.c	Fri Sep 14 23:37:19 2018 +0200
+++ b/lib/master.c	Thu Sep 27 00:21:27 2018 +0200
@@ -543,12 +543,6 @@
     master->process_data_size = io.process_data_size;
 
     if (master->process_data_size) {
-#ifdef USE_RTDM
-        /* memory-mapping was already done in kernel. The user-space addess is
-         * provided in the ioctl data.
-         */
-        master->process_data = io.process_data;
-#else
         master->process_data = mmap(0, master->process_data_size,
                 PROT_READ | PROT_WRITE, MAP_SHARED, master->fd, 0);
         if (master->process_data == MAP_FAILED) {
@@ -558,7 +552,6 @@
             master->process_data_size = 0;
             return -errno;
         }
-#endif
 
         // Access the mapped region to cause the initial page fault
         master->process_data[0] = 0x00;