Index: sys/arm/arm/machdep_intr.c
===================================================================
--- sys/arm/arm/machdep_intr.c
+++ sys/arm/arm/machdep_intr.c
@@ -226,6 +226,7 @@
 
 	isrc->isrc_handlers++;
 	intr_ipi_setup(ipi, name, hand, arg, pic_ipi_send, isrc);
+	PIC_ENABLE_INTR(intr_irq_root_dev, isrc);
 	return (0);
 }
 #endif
Index: sys/arm64/arm64/mp_machdep.c
===================================================================
--- sys/arm64/arm64/mp_machdep.c
+++ sys/arm64/arm64/mp_machdep.c
@@ -345,6 +345,8 @@
 	ii->ii_send_arg = isrc;
 	strlcpy(ii->ii_name, name, INTR_IPI_NAMELEN);
 	ii->ii_count = intr_ipi_setup_counters(name);
+
+	PIC_ENABLE_INTR(intr_irq_root_dev, isrc);
 }
 
 static void