diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index c9c0601..c35d74c 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -37,6 +37,12 @@
 	irq_chip_set_defaults(chip);
 	desc->irq_data.chip = chip;
 	irq_put_desc_unlock(desc, flags);
+	/*
+	 * For !CONFIG_SPARSE_IRQ make the irq show up in
+	 * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
+	 * already marked, and this call is harmless.
+	 */
+	irq_reserve_irq(irq);
 	return 0;
 }
 EXPORT_SYMBOL(irq_set_chip);