1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 1b96616c9f20..72c825c1788e 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -407,3 +407,14 @@ size_t dma_max_mapping_size(struct device *dev)
         return size;
 }
 EXPORT_SYMBOL_GPL(dma_max_mapping_size);
+
+unsigned long dma_get_merge_boundary(struct device *dev)
+{
+        const struct dma_map_ops *ops = get_dma_ops(dev);
+
+        if (!ops || !ops->get_merge_boundary)
+                return 0;       /* can't merge */
+
+        return ops->get_merge_boundary(dev);
+}
+EXPORT_SYMBOL_GPL(dma_get_merge_boundary);