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-rw-r--r--mm/memory_hotplug.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5118028468eb..8285346be663 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1043,17 +1043,23 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
}
-/*
+/**
+ * try_online_node - online a node if offlined
+ *
* called by cpu_up() to online a node without onlined memory.
*/
-int mem_online_node(int nid)
+int try_online_node(int nid)
{
pg_data_t *pgdat;
int ret;
+ if (node_online(nid))
+ return 0;
+
lock_memory_hotplug();
pgdat = hotadd_new_pgdat(nid, 0);
if (!pgdat) {
+ pr_err("Cannot online node %d due to NULL pgdat\n", nid);
ret = -ENOMEM;
goto out;
}
@@ -1061,6 +1067,12 @@ int mem_online_node(int nid)
ret = register_one_node(nid);
BUG_ON(ret);
+ if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
+ mutex_lock(&zonelists_mutex);
+ build_all_zonelists(NULL, NULL);
+ mutex_unlock(&zonelists_mutex);
+ }
+
out:
unlock_memory_hotplug();
return ret;