diff --git a/[refs] b/[refs]
index 2b7f8a4aff7e..28b32bdb8402 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ffe0d5a575459ffe664b0762130b557f826fcace
+refs/heads/master: fb59e72e7e10fd9d31f4e522f1b28254c2cc8a6c
diff --git a/trunk/mm/percpu.c b/trunk/mm/percpu.c
index e5c4cbda6026..a64133f8af45 100644
--- a/trunk/mm/percpu.c
+++ b/trunk/mm/percpu.c
@@ -1347,6 +1347,10 @@ struct pcpu_alloc_info * __init pcpu_build_alloc_info(
 	struct pcpu_alloc_info *ai;
 	unsigned int *cpu_map;
 
+	/* this function may be called multiple times */
+	memset(group_map, 0, sizeof(group_map));
+	memset(group_cnt, 0, sizeof(group_map));
+
 	/*
 	 * Determine min_unit_size, alloc_size and max_upa such that
 	 * alloc_size is multiple of atom_size and is the smallest