diff --git a/mm/filemap.c b/mm/filemap.c
index 81e28722edfa..84a5b0213e0e 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3209,7 +3209,7 @@ static bool filemap_map_pmd(struct vm_fault *vmf, struct page *page)
 	    }
 	}
 
-	if (pmd_none(*vmf->pmd)) {
+	if (pmd_none(*vmf->pmd) && vmf->prealloc_pte) {
 		vmf->ptl = pmd_lock(mm, vmf->pmd);
 		if (likely(pmd_none(*vmf->pmd))) {
 			mm_inc_nr_ptes(mm);