diff --git a/include/linux/mm.h b/include/linux/mm.h
index f1cd22f..0b50d78 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1341,8 +1341,7 @@
 		!vma_growsup(vma->vm_next, addr);
 }
 
-extern struct task_struct *task_of_stack(struct task_struct *task,
-				struct vm_area_struct *vma, bool in_group);
+int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
 
 extern unsigned long move_page_tables(struct vm_area_struct *vma,
 		unsigned long old_addr, struct vm_area_struct *new_vma,