D2126.diff
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	Index: stable/10/sys/sys/mbuf.h
	===================================================================
	--- stable/10/sys/sys/mbuf.h
	+++ stable/10/sys/sys/mbuf.h
	@@ -206,6 +206,16 @@
	#define m_pktdat M_dat.MH.MH_dat.MH_databuf
	#define m_dat M_dat.M_databuf

	+/*
	+ * NOTE: forwards compatibility definitions for mbuf(9)
	+ *
	+ * These aren't 1:1 with the macros in r277203; in particular they're exposed
	+ * to both userland and kernel, whereas this is exposed to just _KERNEL -- to
	+ * avoid disruption with existing KBI/KPIs
	+ */
	+#define MHSIZE offsetof(struct mbuf, m_dat)
	+#define MPKTHSIZE offsetof(struct mbuf, m_pktdat)
	+
	/*
	* mbuf flags of global significance and layer crossing.
	* Those of only protocol/layer specific significance are to be mapped