diff --git a/sys/arm64/arm64/busdma_bounce.h b/sys/arm64/arm64/busdma_bounce.h
--- a/sys/arm64/arm64/busdma_bounce.h
+++ b/sys/arm64/arm64/busdma_bounce.h
@@ -31,11 +31,13 @@
  * SUCH DAMAGE.
  */
 
-static bool _bus_dmamap_pagesneeded(bus_dma_tag_t, bus_dmamap_t,
+#define	DMA_FUNC(f)	f
+
+static bool DMA_FUNC(_bus_dmamap_pagesneeded)(bus_dma_tag_t, bus_dmamap_t,
     vm_paddr_t, bus_size_t, int *);
 
 static bool
-might_bounce(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t paddr,
+DMA_FUNC(might_bounce)(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t paddr,
     bus_size_t size)
 {
 
@@ -56,7 +58,7 @@
 }
 
 static bool
-must_bounce(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t paddr,
+DMA_FUNC(must_bounce)(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t paddr,
     bus_size_t size)
 {
 
@@ -71,17 +73,19 @@
 }
 
 static bool
-bounce_bus_dma_id_mapped(bus_dma_tag_t dmat, vm_paddr_t buf, bus_size_t buflen)
+DMA_FUNC(bounce_bus_dma_id_mapped)(bus_dma_tag_t dmat, vm_paddr_t buf,
+    bus_size_t buflen)
 {
 
-	if (!might_bounce(dmat, NULL, buf, buflen))
+	if (!DMA_FUNC(might_bounce)(dmat, NULL, buf, buflen))
 		return (true);
-	return (!_bus_dmamap_pagesneeded(dmat, NULL, buf, buflen, NULL));
+	return (!DMA_FUNC(_bus_dmamap_pagesneeded)(dmat, NULL, buf, buflen,
+	    NULL));
 }
 
 static bool
-_bus_dmamap_pagesneeded(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
-    bus_size_t buflen, int *pagesneeded)
+DMA_FUNC(_bus_dmamap_pagesneeded)(bus_dma_tag_t dmat, bus_dmamap_t map,
+    vm_paddr_t buf, bus_size_t buflen, int *pagesneeded)
 {
 	bus_addr_t curaddr;
 	bus_size_t sgsize;
@@ -95,7 +99,7 @@
 	curaddr = buf;
 	while (buflen != 0) {
 		sgsize = buflen;
-		if (must_bounce(dmat, map, curaddr, sgsize)) {
+		if (DMA_FUNC(must_bounce)(dmat, map, curaddr, sgsize)) {
 			sgsize = MIN(sgsize,
 			    PAGE_SIZE - (curaddr & PAGE_MASK));
 			if (pagesneeded == NULL)
@@ -112,20 +116,20 @@
 }
 
 static void
-_bus_dmamap_count_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
-    bus_size_t buflen, int flags)
+DMA_FUNC(_bus_dmamap_count_phys)(bus_dma_tag_t dmat, bus_dmamap_t map,
+    vm_paddr_t buf, bus_size_t buflen, int flags)
 {
 
 	if (map->pagesneeded == 0) {
-		_bus_dmamap_pagesneeded(dmat, map, buf, buflen,
+		DMA_FUNC(_bus_dmamap_pagesneeded)(dmat, map, buf, buflen,
 		    &map->pagesneeded);
 		CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded);
 	}
 }
 
 static void
-_bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, pmap_t pmap,
-    void *buf, bus_size_t buflen, int flags)
+DMA_FUNC(_bus_dmamap_count_pages)(bus_dma_tag_t dmat, bus_dmamap_t map,
+    pmap_t pmap, void *buf, bus_size_t buflen, int flags)
 {
 	vm_offset_t vaddr;
 	vm_offset_t vendaddr;
@@ -153,7 +157,8 @@
 				paddr = pmap_kextract(vaddr);
 			else
 				paddr = pmap_extract(pmap, vaddr);
-			if (must_bounce(dmat, map, paddr, sg_len) != 0) {
+			if (DMA_FUNC(must_bounce)(dmat, map, paddr, sg_len) !=
+			    0) {
 				sg_len = roundup2(sg_len,
 				    dmat->common.alignment);
 				map->pagesneeded++;
@@ -169,7 +174,7 @@
  * the starting segment on entrace, and the ending segment on exit.
  */
 static int
-bounce_bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
+DMA_FUNC(bounce_bus_dmamap_load_phys)(bus_dma_tag_t dmat, bus_dmamap_t map,
     vm_paddr_t buf, bus_size_t buflen, int flags, bus_dma_segment_t *segs,
     int *segp)
 {
@@ -181,8 +186,8 @@
 	if (segs == NULL)
 		segs = dmat->segments;
 
-	if (might_bounce(dmat, map, (bus_addr_t)buf, buflen)) {
-		_bus_dmamap_count_phys(dmat, map, buf, buflen, flags);
+	if (DMA_FUNC(might_bounce)(dmat, map, (bus_addr_t)buf, buflen)) {
+		DMA_FUNC(_bus_dmamap_count_phys)(dmat, map, buf, buflen, flags);
 		if (map->pagesneeded != 0) {
 			error = _bus_dmamap_reserve_pages(dmat, map, flags);
 			if (error)
@@ -197,7 +202,7 @@
 		curaddr = buf;
 		sgsize = buflen;
 		if (map->pagesneeded != 0 &&
-		    must_bounce(dmat, map, curaddr, sgsize)) {
+		    DMA_FUNC(must_bounce)(dmat, map, curaddr, sgsize)) {
 			/*
 			 * The attempt to split a physically continuous buffer
 			 * seems very controversial, it's unclear whether we
@@ -251,9 +256,9 @@
  * the starting segment on entrace, and the ending segment on exit.
  */
 static int
-bounce_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
-    bus_size_t buflen, pmap_t pmap, int flags, bus_dma_segment_t *segs,
-    int *segp)
+DMA_FUNC(bounce_bus_dmamap_load_buffer)(bus_dma_tag_t dmat, bus_dmamap_t map,
+    void *buf, bus_size_t buflen, pmap_t pmap, int flags,
+    bus_dma_segment_t *segs, int *segp)
 {
 	struct sync_list *sl;
 	bus_size_t sgsize;
@@ -272,8 +277,9 @@
 	if (flags & BUS_DMA_LOAD_MBUF)
 		map->flags |= DMAMAP_MBUF;
 
-	if (might_bounce(dmat, map, (bus_addr_t)buf, buflen)) {
-		_bus_dmamap_count_pages(dmat, map, pmap, buf, buflen, flags);
+	if (DMA_FUNC(might_bounce)(dmat, map, (bus_addr_t)buf, buflen)) {
+		DMA_FUNC(_bus_dmamap_count_pages)(dmat, map, pmap, buf, buflen,
+		    flags);
 		if (map->pagesneeded != 0) {
 			error = _bus_dmamap_reserve_pages(dmat, map, flags);
 			if (error)
@@ -312,7 +318,7 @@
 			sgsize = MIN(sgsize, PAGE_SIZE - (curaddr & PAGE_MASK));
 
 		if (map->pagesneeded != 0 &&
-		    must_bounce(dmat, map, curaddr, sgsize)) {
+		    DMA_FUNC(must_bounce)(dmat, map, curaddr, sgsize)) {
 			/* See comment in bounce_bus_dmamap_load_phys */
 			KASSERT(dmat->common.alignment <= PAGE_SIZE,
 			    ("bounced buffer cannot have alignment bigger "
@@ -364,7 +370,7 @@
 }
 
 static void
-bounce_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map,
+DMA_FUNC(bounce_bus_dmamap_sync)(bus_dma_tag_t dmat, bus_dmamap_t map,
     bus_dmasync_op_t op)
 {
 	struct bounce_page *bpage;
@@ -461,3 +467,5 @@
 
 	kmsan_bus_dmamap_sync(&map->kmsan_mem, op);
 }
+
+#undef DMA_FUNC