1 files changed, 4 insertions, 4 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 1ae2b2cc3a5..70df5c0d957 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -91,8 +91,8 @@ static void grow_zone_span(struct zone *zone,
         if (start_pfn < zone->zone_start_pfn)
                 zone->zone_start_pfn = start_pfn;
 
-        if (end_pfn > old_zone_end_pfn)
-                zone->spanned_pages = end_pfn - zone->zone_start_pfn;
+        zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
+                                zone->zone_start_pfn;
 
         zone_span_writeunlock(zone);
 }
@@ -106,8 +106,8 @@ static void grow_pgdat_span(struct pglist_data *pgdat,
         if (start_pfn < pgdat->node_start_pfn)
                 pgdat->node_start_pfn = start_pfn;
 
-        if (end_pfn > old_pgdat_end_pfn)
-                pgdat->node_spanned_pages = end_pfn - pgdat->node_start_pfn;
+        pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
+                                        pgdat->node_start_pfn;
 }
 
 int online_pages(unsigned long pfn, unsigned long nr_pages)