1 files changed, 4 insertions, 2 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 616236e6343f..efe3e0ec2e61 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -339,8 +339,11 @@ EXPORT_SYMBOL_GPL(__remove_pages);
 
 void online_page(struct page *page)
 {
+        unsigned long pfn = page_to_pfn(page);
+
         totalram_pages++;
-        num_physpages++;
+        if (pfn >= num_physpages)
+                num_physpages = pfn + 1;
 
 #ifdef CONFIG_HIGHMEM
         if (PageHighMem(page))
@@ -832,7 +835,6 @@ repeat:
         zone->present_pages -= offlined_pages;
         zone->zone_pgdat->node_present_pages -= offlined_pages;
         totalram_pages -= offlined_pages;
-        num_physpages -= offlined_pages;
 
         setup_per_zone_wmarks();
         calculate_zone_inactive_ratio(zone);