diff --git a/mm/sparse.c b/mm/sparse.c
index a2183cb..7859c80 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -353,17 +353,9 @@
 	return __kmalloc_section_memmap(nr_pages);
 }
 
-static int vaddr_in_vmalloc_area(void *addr)
-{
-	if (addr >= (void *)VMALLOC_START &&
-	    addr < (void *)VMALLOC_END)
-		return 1;
-	return 0;
-}
-
 static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
 {
-	if (vaddr_in_vmalloc_area(memmap))
+	if (is_vmalloc_addr(memmap))
 		vfree(memmap);
 	else
 		free_pages((unsigned long)memmap,