Subject: Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output() helper

From: Alexei Starovoitov <[email-masked]>
Date: Thu, 22 Oct 2015 08:38:02 -0700

On 10/22/15 6:59 AM, Peter Zijlstra wrote:
>> +	if (unlikely(event->oncpu != smp_processor_id()))
>> >+		return -EOPNOTSUPP;
>> >+
>> >+	perf_sample_data_init(&sample_data, 0, 0);
>> >+	sample_data.raw = &raw;
>> >+	perf_event_output(event, &sample_data, regs);
>> >+	return 0;
>> >+}
> Note that this function also very much requires event to be local.

correct. that's why there is a dynamic check above to prevent buggy
programs causing issues.