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-rw-r--r--mm/memory_hotplug.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9f646374e32..c46887b5a11 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -494,6 +494,14 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
/* init node's zones as empty zones, we don't have any present pages.*/
free_area_init_node(nid, zones_size, start_pfn, zholes_size);
+ /*
+ * The node we allocated has no zone fallback lists. For avoiding
+ * to access not-initialized zonelist, build here.
+ */
+ mutex_lock(&zonelists_mutex);
+ build_all_zonelists(NULL);
+ mutex_unlock(&zonelists_mutex);
+
return pgdat;
}
@@ -515,7 +523,7 @@ int mem_online_node(int nid)
lock_memory_hotplug();
pgdat = hotadd_new_pgdat(nid, 0);
- if (pgdat) {
+ if (!pgdat) {
ret = -ENOMEM;
goto out;
}