}
static const struct pipe_buf_operations ring_buffer_pipe_buf_ops = {
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(5,1,0))
.can_merge = 0,
+#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0))
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,