--- zzzz-none-000/linux-4.4.60/drivers/of/device.c	2017-04-08 07:53:53.000000000 +0000
+++ hawkeye-5590-729/linux-4.4.60/drivers/of/device.c	2022-03-30 14:21:52.000000000 +0000
@@ -88,7 +88,7 @@
 	int ret;
 	bool coherent;
 	unsigned long offset;
-	struct iommu_ops *iommu;
+	const struct iommu_ops *iommu;
 
 	/*
 	 * Set default coherent_dma_mask to 32 bit.  Drivers are expected to
@@ -287,3 +287,4 @@
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
\ No newline at end of file