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

Daniel Borkmann says:

====================
pull-request: bpf-next 2020-06-02

The following pull-request contains BPF _fixes-only_ for your *net-next*
tree.

We've added 10 non-merge commits during the last 1 day(s) which contain
a total of 15 files changed, 229 insertions(+), 74 deletions(-).

The main changes are:

1) Several fixes to s390 BPF JIT e.g. fixing kernel panic when BPF stack is
   not 8-byte aligned, from Ilya Leoshkevich.

2) Fix bpf_skb_adjust_room() helper's CHECKSUM_UNNECESSARY handling which
   was wrongly bypassing TCP checksum verification, from Daniel Borkmann.

3) Fix tools/bpf/ build under MAKEFLAGS=rR which causes built-in CXX and
   others vars to be undefined, also from Ilya Leoshkevich.

4) Fix BPF ringbuf's selftest shared sample_cnt variable to avoid compiler
   optimizations on it, from Andrii Nakryiko.

5) Fix up test_verifier selftest due to addition of rx_queue_mapping to
   the bpf_sock structure, from Alexei Starovoitov.
====================

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