Index: sys/arm64/arm64/busdma_bounce.c
===================================================================
--- sys/arm64/arm64/busdma_bounce.c
+++ sys/arm64/arm64/busdma_bounce.c
@@ -216,7 +216,7 @@
 		if (ptoa(bz->total_bpages) < maxsize) {
 			int pages;
 
-			pages = atop(maxsize) - bz->total_bpages;
+			pages = atop(round_page(maxsize)) - bz->total_bpages;
 
 			/* Add pages to our bounce pool */
 			if (alloc_bounce_pages(newtag, pages) < pages)