Avoid using nfsd process pools on SMP machines.

Avoid using nfsd process pools on SMP machines.

process-pools have real benefits for NUMA, but on SMP
machines they only work if network interface interrupts
go to all CPUs (via round-robin or multiple nics).  This is
not always the case, so disable the pools in this case until
a better solution is developped.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff .prev/net/sunrpc/svc.c ./net/sunrpc/svc.c