svn commit: r254805 - head/sys/sys

[Andre Oppermann]

Author: andre
Date: Sat Aug 24 19:58:36 2013
New Revision: 254805
URL: http://svnweb.freebsd.org/changeset/base/254805

Log:
  Add mtodo(m, o) macro taking an additional offset into the mbuf data section.
  
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/sys/mbuf.h

Modified: head/sys/sys/mbuf.h
==============================================================================
--- head/sys/sys/mbuf.h	Sat Aug 24 19:51:18 2013	(r254804)
+++ head/sys/sys/mbuf.h	Sat Aug 24 19:58:36 2013	(r254805)
@@ -67,8 +67,10 @@
  * type:
  *
  * mtod(m, t)	-- Convert mbuf pointer to data pointer of correct type.
+ * mtodo(m, o) -- Same as above but with offset 'o' into data.
  */
 #define	mtod(m, t)	((t)((m)->m_data))
+#define	mtodo(m, o)	((void *)(((m)->m_data) + (o)))
 
 /*
  * Argument structure passed to UMA routines during mbuf and packet