diff --git a/mm/page_size_compat.c b/mm/page_size_compat.c
index 19cd902aed87..c912ad12ee35 100644
--- a/mm/page_size_compat.c
+++ b/mm/page_size_compat.c
@@ -54,10 +54,17 @@ static int __init page_shift_params(char *param, char *val,
 static int __init init_page_shift_compat(void)
 {
 	char *err;
+	char *command_line;
 
-	err = parse_args("page_shift", saved_command_line, NULL, 0, 0, 0, NULL,
+	command_line = kstrdup(saved_command_line, GFP_KERNEL);
+	if (!command_line)
+		return -ENOMEM;
+
+	err = parse_args("page_shift", command_line, NULL, 0, 0, 0, NULL,
 			page_shift_params);
 
+	kfree(command_line);
+
 	if (IS_ERR(err))
 		return -EINVAL;