--- /dev/null
+--- linux-2.6.27.21/include/linux/skbuff.h 2009-04-03 10:39:10.000000000 +0000
++++ linux-2.6.27.21/include/linux/skbuff.h 2009-04-03 10:41:59.000000000 +0000
+@@ -330,11 +330,17 @@
+ #if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE)
+ __u8 do_not_encrypt:1;
+ #endif
+- /* 0/13/14 bit hole */
++
+ #if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+ __u8 imq_flags:IMQ_F_BITS;
+ #endif
+
++#ifdef CONFIG_XEN
++ __u8 proto_data_valid:1,
++ proto_csum_blank:1;
++#endif
++ /* 10-16 bit hole */
++
+ #ifdef CONFIG_NET_DMA
+ dma_cookie_t dma_cookie;
+ #endif