-void sched_add_before(const ir_node *before, const ir_node *irn);
-void sched_add_after(const ir_node *after, const ir_node *irn);
-void sched_init_block(const ir_node *block);
-void sched_reset(const ir_node *node);
-void sched_remove(const ir_node *irn);
+void sched_add_before(ir_node *before, ir_node *irn);
+void sched_add_after(ir_node *after, ir_node *irn);
+void sched_init_block(ir_node *block);
+void sched_reset(ir_node *node);
+void sched_remove(ir_node *irn);