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| author | Song Liu <songliubraving@fb.com> | 2020-07-23 11:06:46 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-07-25 20:16:35 -0700 |
| commit | d4b4dd6ce7709c2d2fe56dcfc15074ee18505bcb (patch) | |
| tree | 4f13bbdfc94518efcf3f275b3fb6650f5bf52cdc /tools/testing/selftests/bpf/prog_tests/perf_event_stackmap.c | |
| parent | 5d99cb2c86775b4780c02a339a9578bf9471ead9 (diff) | |
| download | linux-d4b4dd6ce7709c2d2fe56dcfc15074ee18505bcb.tar.gz linux-d4b4dd6ce7709c2d2fe56dcfc15074ee18505bcb.tar.bz2 linux-d4b4dd6ce7709c2d2fe56dcfc15074ee18505bcb.zip | |
libbpf: Print hint when PERF_EVENT_IOC_SET_BPF returns -EPROTO
The kernel prevents potential unwinder warnings and crashes by blocking
BPF program with bpf_get_[stack|stackid] on perf_event without
PERF_SAMPLE_CALLCHAIN, or with exclude_callchain_[kernel|user]. Print a
hint message in libbpf to help the user debug such issues.
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200723180648.1429892-4-songliubraving@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/perf_event_stackmap.c')
0 files changed, 0 insertions, 0 deletions