--- a/master/rtdm.c	Fri Oct 05 17:45:44 2018 +0200
+++ b/master/rtdm.c	Fri Oct 05 18:01:39 2018 +0200
@@ -279,8 +279,6 @@
 	size_t len;
     ec_ioctl_context_t *ctx = (ec_ioctl_context_t *) rtdm_fd_to_private(fd);
 	len = vma->vm_end - vma->vm_start;
-	if (ctx->process_data_size != len)
-		return -EINVAL;
 	return rtdm_mmap_kmem(vma, (void *)ctx->process_data);
 }