Re: [PATCH v5 bpf-next 5/5] selftests/bpf: add get_stackid_cannot_attach

On Thu, Jul 23, 2020 at 11:06:48AM -0700, Song Liu wrote: > + pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, > + 0 /* cpu 0 */, -1 /* group id */, > + 0 /* flags */); > + if (pmu_fd < 0 && errno == ENOENT) { > + printf("%s:S

[PATCH v5 bpf-next 5/5] selftests/bpf: add get_stackid_cannot_attach

This test confirms that BPF program that calls bpf_get_stackid() cannot attach to perf_event with precise_ip > 0 but not PERF_SAMPLE_CALLCHAIN; and cannot attach if the perf_event has exclude_callchain_kernel. Signed-off-by: Song Liu --- .../prog_tests/get_stackid_cannot_attach.c| 91 +++