+/**
+ * pipe_buf_mark_unmergeable - mark a &struct pipe_buffer as unmergeable
+ * @buf: the buffer to mark
+ *
+ * Description:
+ * This function ensures that no future writes will be merged into the
+ * given &struct pipe_buffer. This is necessary when multiple pipe buffers
+ * share the same backing page.
+ */
+void pipe_buf_mark_unmergeable(struct pipe_buffer *buf)
+{
+ if (buf->ops == &anon_pipe_buf_ops)
+ buf->ops = &anon_pipe_buf_nomerge_ops;
+}
+
+static bool pipe_buf_can_merge(struct pipe_buffer *buf)
+{
+ return buf->ops == &anon_pipe_buf_ops;
+}
+