dtrace and kernel modules

I'm specifically interested in the case of kernel modules that 
instantiate new syscalls.

How much support do we have for that?  In the one example in our 
sources of a kld with a syscall (kgssapi.ko) dtrace seems to find 
regular function entrypoints but not the syscall.


root_at_porridge:/usr/src # dtrace -n ":kgssapi::entry {}"
dtrace: description ':kgssapi::entry ' matched 138 probes
^C

root_at_porridge:/usr/src # dtrace -n "syscall:kgssapi::entry {}"
dtrace: invalid probe specifier syscall:kgssapi::entry {}: probe 
description syscall:kgssapi::entry does not match any probes
root_at_porridge:/usr/src #


Do we have plans to support dynamic syscall support?