Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Merge git://git./pub/scm/linux/kernel/git/bpf/bpf

Alexei Starovoitov says:

====================
pull-request: bpf 2018-12-18

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) promote bpf_perf_event.h to mandatory UAPI header, from Masahiro.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>