1 files changed, 15 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 23d3339ac4e8..42f03d122804 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -9449,3 +9449,18 @@ bool take_page_off_buddy(struct page *page)
 	return ret;
 }
 #endif
+
+#ifdef CONFIG_ZONE_DMA
+bool has_managed_dma(void)
+{
+	struct pglist_data *pgdat;
+
+	for_each_online_pgdat(pgdat) {
+		struct zone *zone = &pgdat->node_zones[ZONE_DMA];
+
+		if (managed_zone(zone))
+			return true;
+	}
+	return false;
+}
+#endif /* CONFIG_ZONE_DMA */