On Wed, 28 Mar 2018 11:03:24 -0700
Alexei Starovoitov [off-list ref] wrote:

I can live with this overhead if Mathieu insists,
but I prefer to keep it in 'struct tracepoint'.

Thoughts?

I'm fine with keeping it as is. We could probably use it for future
enhancements in perf and ftrace.

Perhaps, we should just add a:

#ifdef CONFIG_BPF_EVENTS

Around the use cases of num_args.

-- Steve