[PATCHv3 bpf-next 0/9] bpf: Move kernel test kfuncs into bpf_testmod

[Jiri Olsa <jolsa@kernel.org>]

hi,
I noticed several times in discussions that we should move test kfuncs
into kernel module, now perhaps even more pressing with all the kfunc
effort. This patchset moves all the test kfuncs into bpf_testmod.

I added bpf_testmod/bpf_testmod_kfunc.h header that is shared between
bpf_testmod kernel module and BPF programs, which brings some difficulties
with __ksym define. But I'm not sure having separate headers for BPF
programs and for kernel module would be better.

This patchset also needs:
  74bc3a5acc82 bpf: Add missing btf_put to register_btf_id_dtor_kfuncs
which is only in bpf/master now.

v3 changes:
  - added acks [David]
  - added bpf_testmod.ko make dependency for bpf test progs [David]
  - better handling of __ksym and refcount_t in bpf_testmod_kfunc.h [David]
  - removed 'extern' from kfuncs declarations [David]
  - typo in header guard macro [David]
  - use only stdout in un/load_bpf_testmod

v2 changes:
  - add 74bc3a5acc82 into bpf-next/master CI, so the test would pass
    https://github.com/kernel-patches/vmtest/pull/192
  - remove extra externs [Artem]
  - using un/load_bpf_testmod in other tests
  - rebased

thanks,
jirka


---
Jiri Olsa (9):
      selftests/bpf: Move kfunc exports to bpf_testmod/bpf_testmod_kfunc.h
      selftests/bpf: Move test_progs helpers to testing_helpers object
      selftests/bpf: Use only stdout in un/load_bpf_testmod functions
      selftests/bpf: Do not unload bpf_testmod in load_bpf_testmod
      selftests/bpf: Use un/load_bpf_testmod functions in tests
      selftests/bpf: Load bpf_testmod for verifier test
      selftests/bpf: Allow to use kfunc from testmod.ko in test_verifier
      selftests/bpf: Remove extern from kfuncs declarations
      bpf: Move kernel test kfuncs to bpf_testmod

 net/bpf/test_run.c                                          | 271 +------------------------------------------------------------------------------------------
 tools/testing/selftests/bpf/Makefile                        |   1 +
 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c       | 206 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h | 102 ++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/bpf_mod_race.c       |  34 ++----------
 tools/testing/selftests/bpf/prog_tests/module_attach.c      |  12 ++--
 tools/testing/selftests/bpf/progs/cb_refs.c                 |   4 +-
 tools/testing/selftests/bpf/progs/jit_probe_mem.c           |   4 +-
 tools/testing/selftests/bpf/progs/kfunc_call_destructive.c  |   3 +-
 tools/testing/selftests/bpf/progs/kfunc_call_fail.c         |   9 +--
 tools/testing/selftests/bpf/progs/kfunc_call_race.c         |   3 +-
 tools/testing/selftests/bpf/progs/kfunc_call_test.c         |  17 +-----
 tools/testing/selftests/bpf/progs/kfunc_call_test_subprog.c |   9 +--
 tools/testing/selftests/bpf/progs/map_kptr.c                |   6 +-
 tools/testing/selftests/bpf/progs/map_kptr_fail.c           |   5 +-
 tools/testing/selftests/bpf/test_progs.c                    |  76 +++-----------------------
 tools/testing/selftests/bpf/test_progs.h                    |   1 -
 tools/testing/selftests/bpf/test_verifier.c                 | 170 +++++++++++++++++++++++++++++++++++++++++++++++++--------
 tools/testing/selftests/bpf/testing_helpers.c               |  61 +++++++++++++++++++++
 tools/testing/selftests/bpf/testing_helpers.h               |  10 ++++
 20 files changed, 556 insertions(+), 448 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h