On 6/20/15, 9:38 AM, Nikolay Aleksandrov wrote:
<<<snip>>>
diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c
new file mode 100644
index 0000000..29c7802
--- /dev/null
+++ b/net/core/lwtunnel.c
@@ -0,0 +1,162 @@
+/*
+ * lwtunnel    Infrastructure for light weight tunnels like mpls
+ *
+ *
+ *             This program is free software; you can redistribute it and/or
+ *             modify it under the terms of the GNU General Public License
+ *             as published by the Free Software Foundation; either version
+ *             2 of the License, or (at your option) any later version.
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <linux/err.h>
+
+#include <net/lwtunnel.h>
+#include <net/rtnetlink.h>
+
+struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
+{
+       struct lwtunnel_state *lws;
+
+       return kzalloc(sizeof(*lws) + hdr_len, GFP_KERNEL);
This seems to be called with rcu_read_lock so GFP_ATOMIC  would have to
be used. (Judging by patch 3/3’s mpls_build_state and lwtunnel_build_state)

yep, correct. thanks
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