1 files changed, 2 insertions, 3 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index c62bd063d766..0d0248db36d8 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -611,8 +611,7 @@ check_compact_cluster:
                 continue;
 
 next_pageblock:
-                low_pfn += pageblock_nr_pages;
-                low_pfn = ALIGN(low_pfn, pageblock_nr_pages) - 1;
+                low_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages) - 1;
                 last_pageblock_nr = pageblock_nr;
         }
 
@@ -795,7 +794,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
         low_pfn = max(cc->migrate_pfn, zone->zone_start_pfn);
 
         /* Only scan within a pageblock boundary */
-        end_pfn = ALIGN(low_pfn + pageblock_nr_pages, pageblock_nr_pages);
+        end_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages);
 
         /* Do not cross the free scanner or scan within a memory hole */
         if (end_pfn > cc->free_pfn || !pfn_valid(low_pfn)) {