diff --git a/drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.h b/drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.h
index 1d7fc3226bca..cfb42a8f5768 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.h
+++ b/drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.h
@@ -53,6 +53,10 @@ extern void
 usnic_uiom_interval_tree_remove(struct usnic_uiom_interval_node *node,
 					struct rb_root_cached *root);
 extern struct usnic_uiom_interval_node *
+usnic_uiom_interval_tree_subtree_search(struct usnic_uiom_interval_node *node,
+					unsigned long start,
+					unsigned long last);
+extern struct usnic_uiom_interval_node *
 usnic_uiom_interval_tree_iter_first(struct rb_root_cached *root,
 					unsigned long start,
 					unsigned long last);
diff --git a/include/linux/interval_tree.h b/include/linux/interval_tree.h
index 2b8026a39906..9d5791e9f737 100644
--- a/include/linux/interval_tree.h
+++ b/include/linux/interval_tree.h
@@ -19,6 +19,10 @@ extern void
 interval_tree_remove(struct interval_tree_node *node,
 		     struct rb_root_cached *root);
 
+extern struct interval_tree_node *
+interval_tree_subtree_search(struct interval_tree_node *node,
+			     unsigned long start, unsigned long last);
+
 extern struct interval_tree_node *
 interval_tree_iter_first(struct rb_root_cached *root,
 			 unsigned long start, unsigned long last);
diff --git a/include/linux/interval_tree_generic.h b/include/linux/interval_tree_generic.h
index 1b400f26f63d..c5a2fed49eb0 100644
--- a/include/linux/interval_tree_generic.h
+++ b/include/linux/interval_tree_generic.h
@@ -77,7 +77,7 @@ ITSTATIC void ITPREFIX ## _remove(ITSTRUCT *node,			      \
  *   Cond2: start <= ITLAST(node)					      \
  */									      \
 									      \
-static ITSTRUCT *							      \
+ITSTATIC ITSTRUCT *							      \
 ITPREFIX ## _subtree_search(ITSTRUCT *node, ITTYPE start, ITTYPE last)	      \
 {									      \
 	while (true) {							      \
diff --git a/include/linux/mm.h b/include/linux/mm.h
index d16b33bacc32..04fa27718cd1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3369,6 +3369,8 @@ void vma_interval_tree_insert_after(struct vm_area_struct *node,
 				    struct rb_root_cached *root);
 void vma_interval_tree_remove(struct vm_area_struct *node,
 			      struct rb_root_cached *root);
+struct vm_area_struct *vma_interval_tree_subtree_search(struct vm_area_struct *node,
+				unsigned long start, unsigned long last);
 struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root_cached *root,
 				unsigned long start, unsigned long last);
 struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
diff --git a/lib/interval_tree.c b/lib/interval_tree.c
index 324766e9bf63..9ceb084b6b4e 100644
--- a/lib/interval_tree.c
+++ b/lib/interval_tree.c
@@ -13,6 +13,7 @@ INTERVAL_TREE_DEFINE(struct interval_tree_node, rb,
 
 EXPORT_SYMBOL_GPL(interval_tree_insert);
 EXPORT_SYMBOL_GPL(interval_tree_remove);
+EXPORT_SYMBOL_GPL(interval_tree_subtree_search);
 EXPORT_SYMBOL_GPL(interval_tree_iter_first);
 EXPORT_SYMBOL_GPL(interval_tree_iter_next);
 
diff --git a/tools/include/linux/interval_tree_generic.h b/tools/include/linux/interval_tree_generic.h
index 1b400f26f63d..c5a2fed49eb0 100644
--- a/tools/include/linux/interval_tree_generic.h
+++ b/tools/include/linux/interval_tree_generic.h
@@ -77,7 +77,7 @@ ITSTATIC void ITPREFIX ## _remove(ITSTRUCT *node,			      \
  *   Cond2: start <= ITLAST(node)					      \
  */									      \
 									      \
-static ITSTRUCT *							      \
+ITSTATIC ITSTRUCT *							      \
 ITPREFIX ## _subtree_search(ITSTRUCT *node, ITTYPE start, ITTYPE last)	      \
 {									      \
 	while (true) {							      \