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-rw-r--r--mm/memory_hotplug.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 71da5c98c9c..1b1ac3db218 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -127,6 +127,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
unsigned long flags;
unsigned long onlined_pages = 0;
struct zone *zone;
+ int need_zonelists_rebuild = 0;
/*
* This doesn't need a lock to do pfn_to_page().
@@ -139,6 +140,14 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages);
pgdat_resize_unlock(zone->zone_pgdat, &flags);
+ /*
+ * If this zone is not populated, then it is not in zonelist.
+ * This means the page allocator ignores this zone.
+ * So, zonelist must be updated after online.
+ */
+ if (!populated_zone(zone))
+ need_zonelists_rebuild = 1;
+
for (i = 0; i < nr_pages; i++) {
struct page *page = pfn_to_page(pfn + i);
online_page(page);
@@ -149,5 +158,8 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
setup_per_zone_pages_min();
+ if (need_zonelists_rebuild)
+ build_all_zonelists();
+
return 0;
}