I'll say it again: if a syscall is supported, it should be possible to trace it. If you remove a system call from Plan 9, then by all means remove the syscallfmt support, of course. But if a system call is still valid, and can be called, deprecated or not, I don't see the point of not being able to trace it. I note that your patch was against 9, not nix. Did you remove those system deprecated system calls when you removed support for printing them?
ron
