With a LTO kernel built with clang, with one of earlier version of kernel,
I encountered two test failures, ksyms and kprobe_multi_bench_attach/kernel.
Now with latest bpf-next, only kprobe_multi_bench_attach/kernel failed.
But it is possible in the future ksyms selftest may fail again.
Both test failures are due to static variable/function renaming
due to cross-file inlining. For Ksyms failure, the solution is
to strip .llvm.<hash> suffixes for symbols in /proc/kallsyms before
comparing against the ksym in bpf program.
For kprobe_multi_bench_attach/kernel failure, the solution is
to either provide names in /proc/kallsyms to the kernel or
ignore those names who have .llvm.<hash> suffix since the kernel
sym name comparison is against /proc/kallsyms.
Please see each individual patches for details.
Yonghong Song (5):
selftests/bpf: Replace CHECK with ASSERT macros for ksyms test
libbpf: Mark libbpf_kallsyms_parse static function
libbpf: Handle <orig_name>.llvm.<hash> symbol properly
selftests/bpf: Fix kprobe_multi_bench_attach test failure with LTO
kernel
selftests/bpf: Add a selftest with available_filter_functions_addrs
tools/lib/bpf/libbpf.c | 66 +++++++-
tools/lib/bpf/libbpf_internal.h | 2 -
.../bpf/prog_tests/kprobe_multi_test.c | 151 ++++++++++++++++++
.../testing/selftests/bpf/prog_tests/ksyms.c | 30 ++--
4 files changed, 224 insertions(+), 25 deletions(-)
--
2.43.0
