diff --git a/mm/percpu.c b/mm/percpu.c
index ddc5efb9c5bbe419d790f7e87af82ec7d30cffbc..8c8e08f3a692ecf614fabd537aa9dc4e00f42b21 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -631,7 +631,7 @@ static void pcpu_free_chunk(struct pcpu_chunk *chunk)
 	if (!chunk)
 		return;
 	pcpu_mem_free(chunk->map, chunk->map_alloc * sizeof(chunk->map[0]));
-	kfree(chunk);
+	pcpu_mem_free(chunk, pcpu_chunk_struct_size);
 }
 
 /*
@@ -1380,6 +1380,9 @@ enum pcpu_fc pcpu_chosen_fc __initdata = PCPU_FC_AUTO;
 
 static int __init percpu_alloc_setup(char *str)
 {
+	if (!str)
+		return -EINVAL;
+
 	if (0)
 		/* nada */;
 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK