mm: take memory hotplug lock within numa_zonelist_order_handler()

[sfrench/cifs-2.6.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6d30e914afb6c1b9ecc77b33ee5e01fc7a0ed6b3..fc32aa81f3593537cc2b11d5f63b5c5f517097a4 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4891,9 +4891,11 @@ int numa_zonelist_order_handler(struct ctl_table *table, int write,
                                NUMA_ZONELIST_ORDER_LEN);
                        user_zonelist_order = oldval;
                } else if (oldval != user_zonelist_order) {
+                       mem_hotplug_begin();
                        mutex_lock(&zonelists_mutex);
                        build_all_zonelists(NULL, NULL);
                        mutex_unlock(&zonelists_mutex);
+                       mem_hotplug_done();
                }
        }
 out: