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

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

[Yonghong Song]

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(-)

-- 
2.43.0

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

[Yonghong Song]

On 3/2/24 8:20 AM, Yonghong Song wrote:
> 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(-)
>
Please ignore this one. It is my git send script issue with Message-Id vs. Message-ID.
Will post actual series soon.

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

[Yonghong Song]

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(-)

-- 
2.43.0