I've been poking around, and I'm just wondering whether or not, in
syscall_fancy()/syscall_plain(), rval[1] should be assigned 0 or
frame->tf_rdx.  And should child_return() set tf_rdx=0 (as it is), or
to 1?  I can't seem to find a straight answer on google (read: this is
too new to me for me to be certain from reading the code alone).

Just wanted to make sure there wasn't a bug lurking.

Thanks,

--Blair