diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index 0c58e32..1be629b 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -175,6 +175,16 @@
 extern struct task_struct *_switch(struct thread_struct *prev,
 				   struct thread_struct *next);
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 extern unsigned int rtas_data;
 extern int mem_init_done;	/* set on boot once kmalloc can be called */
 extern unsigned long memory_limit;