D3012.id54425.diff
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	Index: head/sys/sys/bus_dma.h
	===================================================================
	--- head/sys/sys/bus_dma.h
	+++ head/sys/sys/bus_dma.h
	@@ -282,13 +282,25 @@
	void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);

	/*
	- * Perform a synchronization operation on the given map.
	+ * Perform a synchronization operation on the given map. If the map
	+ * is NULL we have a fully IO-coherent system. On every ARM architecture
	+ * there must be a memory barrier placed to ensure that all data
	+ * accesses are visible before going any further.
	*/
	void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
	+#if defined(__arm__)
	+ #define __BUS_DMAMAP_SYNC_DEFAULT mb();
	+#elif defined(__aarch64__)
	+ #define __BUS_DMAMAP_SYNC_DEFAULT dmb(sy);
	+#else
	+ #define __BUS_DMAMAP_SYNC_DEFAULT {}
	+#endif
	#define bus_dmamap_sync(dmat, dmamap, op) \
	do { \
	if ((dmamap) != NULL) \
	_bus_dmamap_sync(dmat, dmamap, op); \
	+ else \
	+ __BUS_DMAMAP_SYNC_DEFAULT \
	} while (0)

	/*