diff --git a/mm/Kconfig b/mm/Kconfig
index efee5d3..446c658 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -208,3 +208,6 @@
 config VIRT_TO_BUS
 	def_bool y
 	depends on !ARCH_NO_VIRT_TO_BUS
+
+config MMU_NOTIFIER
+	bool