mm, hotplug: protect zonelist building with zonelists_mutex

[linux-2.6-block.git] / mm / memory_hotplug.c

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 78dba9f04b5b7132d6e9c4090be80e0288d1633f..c46887b5a11eaa5bbe48008d16ad71bd37f7302f 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -498,7 +498,9 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
         * 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;
 }