+ /* Note how we use radeon_bo_is_referenced_by_cs here. There are
+ * basically two places this map function can be called from:
+ * - pb_map
+ * - create_buffer (in the buffer reuse case)
+ *
+ * Since pb managers are per-winsys managers, not per-context managers,
+ * and we shouldn't reuse buffers if they are in-use in any context,
+ * we simply ask: is this buffer referenced by *any* CS?
+ *
+ * The problem with buffer_create is that it comes from pipe_screen,
+ * so we have no CS to look at, though luckily the following code
+ * is sufficient to tell whether the buffer is in use. */