trap.c: Why do we save tf_edx in sysmsg_fds[1]?

[Justin C. Sherrill]

Matthew Dillon <dillon at xxxxxxxxxxxxxxxxxxxx> wrote in
news:200311101828.hAAISIgp037961 at xxxxxxxxxxxxxxxxxxxx: 

>     I'll document the edx assignment in trap.c so nobody else falls
>     into the same trap.  heh.  get it?  falls into the same trap? 
>     Sigh, my humor is getting horrible these days.

Maybe it's cause I'm not a kernel programmer, but the joke just didn't
register.  Sometimes it's hard to predict where your humor will branch,
though usually it stays inline.