1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 3e8b3ba27175..124ad9d6be16 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -357,8 +357,11 @@ int __cpuinit cpu_up(unsigned int cpu)
                 return -ENOMEM;
         }
 
-        if (pgdat->node_zonelists->_zonerefs->zone == NULL)
+        if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
+                mutex_lock(&zonelists_mutex);
                 build_all_zonelists(NULL);
+                mutex_unlock(&zonelists_mutex);
+        }
 #endif
 
         cpu_maps_update_begin();