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

Daniel Borkmann says:

====================
pull-request: bpf 2021-11-05

We've added 15 non-merge commits during the last 3 day(s) which contain
a total of 14 files changed, 199 insertions(+), 90 deletions(-).

The main changes are:

1) Fix regression from stack spill/fill of <8 byte scalars, from Martin KaFai Lau.

2) Fix perf's build of bpftool's bootstrap version due to missing libbpf
   headers, from Quentin Monnet.

3) Fix riscv{32,64} BPF exception tables build errors and warnings, from Björn Töpel.

4) Fix bpf fs to allow RENAME_EXCHANGE support for atomic upgrades on sk_lookup
   control planes, from Lorenz Bauer.

5) Fix libbpf's error reporting in bpf_map_lookup_and_delete_elem_flags() due to
   missing libbpf_err_errno(), from Mehrdad Arshad Rad.

6) Various fixes to make xdp_redirect_multi selftest more reliable, from Hangbin Liu.

7) Fix netcnt selftest to make it run serial and thus avoid conflicts with other
   cgroup/skb selftests run in parallel that could cause flakes, from Andrii Nakryiko.

8) Fix reuseport_bpf_numa networking selftest to skip unavailable NUMA nodes,
   from Kleber Sacilotto de Souza.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  riscv, bpf: Fix RV32 broken build, and silence RV64 warning
  selftests/bpf/xdp_redirect_multi: Limit the tests in netns
  selftests/bpf/xdp_redirect_multi: Give tcpdump a chance to terminate cleanly
  selftests/bpf/xdp_redirect_multi: Use arping to accurate the arp number
  selftests/bpf/xdp_redirect_multi: Put the logs to tmp folder
  libbpf: Fix lookup_and_delete_elem_flags error reporting
  bpftool: Install libbpf headers for the bootstrap version, too
  selftests/net: Fix reuseport_bpf_numa by skipping unavailable nodes
  selftests/bpf: Verifier test on refill from a smaller spill
  bpf: Do not reject when the stack read size is different from the tracked scalar size
  selftests/bpf: Make netcnt selftests serial to avoid spurious failures
  selftests/bpf: Test RENAME_EXCHANGE and RENAME_NOREPLACE on bpffs
  selftests/bpf: Convert test_bpffs to ASSERT macros
  libfs: Support RENAME_EXCHANGE in simple_rename()
  libfs: Move shmem_exchange to simple_rename_exchange
====================

Link: https://lore.kernel.org/r/20211105165803.29372-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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