sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   2f7de9865ba3cbfcf8b504f07154fdb6124176a4
Checkpoint bpf-next commit: b0efc216f577997bf563d76d51673ed79c3d5f71
Baseline bpf commit:        87f92ac4c12758c4da3bbe4393f1d884b610b8a6
Checkpoint bpf commit:      9cf51446e68607136e42a4e531a30c888c472463

Alan Maguire (2):
  bpf: Add bpf_snprintf_btf helper
  bpf: Add bpf_seq_printf_btf helper

Andrii Nakryiko (11):
  libbpf: Refactor internals of BTF type index
  libbpf: Remove assumption of single contiguous memory for BTF data
  libbpf: Generalize common logic for managing dynamically-sized arrays
  libbpf: Extract generic string hashing function for reuse
  libbpf: Allow modification of BTF and add btf__add_str API
  libbpf: Add btf__new_empty() to create an empty BTF object
  libbpf: Add BTF writing APIs
  libbpf: Add btf__str_by_offset() as a more generic variant of
    name_by_offset
  selftests/bpf: Test BTF writing APIs
  libbpf: Support BTF loading and raw data output in both endianness
  libbpf: Fix uninitialized variable in btf_parse_type_sec

Martin KaFai Lau (4):
  bpf: Change bpf_sk_release and bpf_sk_*cgroup_id to accept
    ARG_PTR_TO_BTF_ID_SOCK_COMMON
  bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON
  bpf: Change bpf_tcp_*_syncookie to accept
    ARG_PTR_TO_BTF_ID_SOCK_COMMON
  bpf: Change bpf_sk_assign to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON

Song Liu (3):
  bpf: Fix comment for helper bpf_current_task_under_cgroup()
  bpf: Enable BPF_PROG_TEST_RUN for raw_tracepoint
  libbpf: Support test run of raw tracepoint programs

Toke Høiland-Jørgensen (2):
  bpf: Support attaching freplace programs to multiple attach points
  libbpf: Add support for freplace attachment in bpf_link_create

YiFei Zhu (2):
  bpf: Add BPF_PROG_BIND_MAP syscall
  libbpf: Add BPF_PROG_BIND_MAP syscall and use it on .rodata section

Yonghong Song (1):
  libbpf: Fix a compilation error with xsk.c for ubuntu 16.04

 include/uapi/linux/bpf.h |  118 ++-
 src/bpf.c                |   67 +-
 src/bpf.h                |   39 +-
 src/btf.c                | 1851 ++++++++++++++++++++++++++++++++------
 src/btf.h                |   51 ++
 src/btf_dump.c           |    9 +-
 src/hashmap.h            |   12 +
 src/libbpf.c             |  113 ++-
 src/libbpf.h             |    3 +
 src/libbpf.map           |   28 +
 src/libbpf_internal.h    |    8 +
 src/xsk.c                |    1 +
 12 files changed, 1997 insertions(+), 303 deletions(-)

--
2.24.1

BPF-CHECKPOINT-COMMIT

@@ -1 +1 @@
-87f92ac4c12758c4da3bbe4393f1d884b610b8a6
+9cf51446e68607136e42a4e531a30c888c472463

CHECKPOINT-COMMIT

@@ -1 +1 @@
-2f7de9865ba3cbfcf8b504f07154fdb6124176a4
+b0efc216f577997bf563d76d51673ed79c3d5f71