[bpf-next,0/4] selftests/bpf: Fix a couple of test failures with LTO kernel

Message

Yonghong Song March 2, 2024, 4:50 p.m. UTC

With a LTO kernel built with clang, I encountered two test failures,
ksyms and kprobe_multi_bench_attach/kernel. Both test failures are
due to static variable/function renaming due to cross-file inlining.
The solution is to either skip the test or filter out those renamed
functions. A helper function check_lto_kernel() is introduced to
identify whether the underlying kernel is built with LTO or not.
Please see each individual patches for details.

Yonghong Song (4):
  selftests/bpf: Replace CHECK with ASSERT macros for ksyms test
  selftests/bpf: Add check_lto_kernel() helper
  selftests/bpf: Fix possible ksyms test failure with LTO kernel
  selftests/bpf: Fix possible kprobe_multi_bench_attach test failure
    with LTO kernel

 .../bpf/prog_tests/kprobe_multi_test.c        |  7 +++
 .../testing/selftests/bpf/prog_tests/ksyms.c  | 42 +++++++++--------
 tools/testing/selftests/bpf/testing_helpers.c | 47 +++++++++++++++++++
 tools/testing/selftests/bpf/testing_helpers.h |  1 +
 4 files changed, 78 insertions(+), 19 deletions(-)