diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 878532b61762..3d09062f4682 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -279,3 +279,11 @@ void __init init_IRQ(void)
 
 	irq_ctx_init(smp_processor_id());
 }
+
+#ifdef CONFIG_SPARSE_IRQ
+int __init arch_probe_nr_irqs(void)
+{
+	nr_irqs = sh_mv.mv_nr_irqs;
+	return 0;
+}
+#endif