Here is the list of code that has been possibly incorrectly dropped in
the x86_64 port.
code in mmap to check the MAP_MIGRATE flag. The base code
is rather different so I'm not sure how to deal with this yet.
csum_partial_copy_from_user - cope with remote user process
Definition of thread_rsp0 - used in ret_from_rproc in
A whole bunch of stuff in arch/x86_64/ia32.
Not needed any more, ret_from_rproc has changed.
Probably only relevant for 32bit libcluster. To be done