From: Daniel Borkmann <daniel@iogearbox.net>
Date: Fri, 29 May 2015 23:23:07 +0200

Besides others, move bpf_tail_call_proto to the remaining definitions
of other protos, improve comments a bit (i.e. remove some obvious ones,
where the code is already self-documenting, add objectives for others),
simplify bpf_prog_array_compatible() a bit.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

Applied.