Subject: Re: [PATCH v3 net-next] bpf: fix bpf_perf_event_read() helper

From: Alexei Starovoitov <[email-masked]>
Date: Fri, 23 Oct 2015 07:42:22 -0700

On 10/23/15 5:03 AM, Peter Zijlstra wrote:
> So the bpf_perf_event_read() returns the count value, does this not also
> mean that returning -EINVAL here is also 'wrong'?
>
> I mean, sure an actual count value that high is unlikely, but its still
> a broken interface.

Agree. that's not pretty interface. I wish I looked at it more carefully
when it was introduced. Now it's too late to change.