[PATCH bpf-next 0/4] libbpf: allow to opt-out from BPF map creation

[Andrii Nakryiko <andrii@kernel.org>]

Add bpf_map__set_autocreate() API which is a BPF map counterpart of
bpf_program__set_autoload() and serves similar goal of allowing to build more
flexible CO-RE applications. See patch #3 for example scenarios in which the
need for such API came up previously.

Patch #1 is a follow-up patch to previous patch set adding verifier log fixup
logic, making sure bpf_core_format_spec()'s return result is used for
something useful.

Patch #2 is a small refactoring to avoid unnecessary verbose memory management
around obj->maps array.

Patch #3 adds and API and corresponding BPF verifier log fix up logic to
provide human-comprehensible error message with useful details.

Patch #4 adds a simple selftest validating both the API itself and libbpf's
log fixup logic for it.

Andrii Nakryiko (4):
  libbpf: append "..." in fixed up log if CO-RE spec is truncated
  libbpf: use libbpf_mem_ensure() when allocating new map
  libbpf: allow to opt-out from creating BPF maps
  selftests/bpf: test bpf_map__set_autocreate() and related log fixup
    logic

 tools/lib/bpf/libbpf.c                        | 169 +++++++++++++-----
 tools/lib/bpf/libbpf.h                        |  22 +++
 tools/lib/bpf/libbpf.map                      |   4 +-
 .../selftests/bpf/prog_tests/log_fixup.c      |  37 +++-
 .../selftests/bpf/progs/test_log_fixup.c      |  26 +++
 5 files changed, 209 insertions(+), 49 deletions(-)

-- 
2.30.2