IA64, PPC system call path audit patches

[Peter Chubb]

You've only caught the IA64 slow path system call entries.  The fast path
is highly optimised assembly language inside arch/ia64/kernel/fsys.S,
that avoids doing a trap at all.

With a modern libc, syscall_via_break is only called for a very few
system calls.

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia