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perf/core: Call perf_prepare_sample() before running BPF

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As BPF can access sample data, it needs to populate the data.  Also
remove the logic to get the callchain specifically as it's covered by
the perf_prepare_sample() now.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230118060559.615653-9-namhyung@kernel.org
This commit is contained in:
Namhyung Kim 2023-01-17 22:05:59 -08:00 committed by Ingo Molnar
parent f6e707156e
commit 0eed282205
1 changed files with 1 additions and 7 deletions
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8
kernel/events/core.c
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@ -10356,13 +10356,7 @@ static void bpf_overflow_handler(struct perf_event *event,
rcu_read_lock();
prog = READ_ONCE(event->prog);
if (prog) {
if (prog->call_get_stack &&
(event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) &&
!(data->sample_flags & PERF_SAMPLE_CALLCHAIN)) {
data->callchain = perf_callchain(event, regs);
data->sample_flags |= PERF_SAMPLE_CALLCHAIN;
}
perf_prepare_sample(data, event, regs);
ret = bpf_prog_run(prog, &ctx);
}
rcu_read_unlock();