diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ba09a3aeb76b..6c524fb76b31 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -459,11 +459,10 @@ static inline int pfn_to_bitidx(struct page *page, unsigned long pfn)
 {
 #ifdef CONFIG_SPARSEMEM
 	pfn &= (PAGES_PER_SECTION-1);
-	return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
 #else
 	pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages);
-	return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
 #endif /* CONFIG_SPARSEMEM */
+	return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
 }
 
 /**