I think that emulations should not depend on the code to be present.
   Each should use their own version of the routines. This would not
   be too hard if compat_43 code is split to individual files by
   function. Emulation would pull in stuff it needs and rename
   symbols with #define appropriately.


with the potential for these functions to be duplicated N times, i think
that's the wrong way to go.  like normal userland libraries, we should
build up LKM libraries to avoid this duplication (which costs in wired
kernel pages).