diff --git a/mm/gup.c b/mm/gup.c
index ec4f827..fc04f1c 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -632,7 +632,8 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 	return i;
 }
 
-bool vma_permits_fault(struct vm_area_struct *vma, unsigned int fault_flags)
+static bool vma_permits_fault(struct vm_area_struct *vma,
+			      unsigned int fault_flags)
 {
 	bool write   = !!(fault_flags & FAULT_FLAG_WRITE);
 	bool foreign = !!(fault_flags & FAULT_FLAG_REMOTE);