diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 914662428dbd434f4ffc7c7a84b0720a1308e0bb..d3bd02105d1c47ef182c9533f94285eb1d560533 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -480,10 +480,10 @@ static struct extent_map *prev_extent_map(struct extent_map *em)
  * and an extent that you want to insert, deal with overlap and insert
  * the best fitted new extent into the tree.
  */
-static int merge_extent_mapping(struct extent_map_tree *em_tree,
-				struct extent_map *existing,
-				struct extent_map *em,
-				u64 map_start)
+static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
+					 struct extent_map *existing,
+					 struct extent_map *em,
+					 u64 map_start)
 {
 	struct extent_map *prev;
 	struct extent_map *next;