No please don't do that. For lots of reasons. Instead test it, fix
the bugs that have stopped it from being enabled in a better way,
and do so as a community. #ifndef does not actually help that process.
>For future testing purposes, is this ok for the tree?
>RCS file: /cvs/src/sys/net/if.c,v
>retrieving revision 1.570
>diff -u -p -u -r1.570 if.c
>--- if.c 20 Dec 2018 10:26:36 -0000 1.570
>+++ if.c 30 Dec 2018 18:49:41 -0000
>@@ -233,7 +233,9 @@ int ifq_congestion;
> int netisr;
> #define NET_TASKQ 1
> struct taskq *nettqmp[NET_TASKQ];
> struct task if_input_task_locked = TASK_INITIALIZER(if_netisr, NULL);