diff --git a/mm/nommu.c b/mm/nommu.c
index 7296360fc057e5..3e67e7538ecf04 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1213,11 +1213,9 @@ static int do_mmap_private(struct vm_area_struct *vma,
 	if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) {
 		total = point;
 		kdebug("try to alloc exact %lu pages", total);
-		base = alloc_pages_exact(len, GFP_KERNEL);
-	} else {
-		base = (void *)__get_free_pages(GFP_KERNEL, order);
 	}
 
+	base = alloc_pages_exact(total << PAGE_SHIFT, GFP_KERNEL);
 	if (!base)
 		goto enomem;