Re: [PATCH bpf-next 5/6] bpf: Improve tracing recursion prevention mechanism

[Steven Rostedt]

On Thu, 27 Apr 2023 23:23:31 +0800
Yafang Shao <laoar.shao@xxxxxxxxx> wrote:

> > But I thought you can run a bpf_prog from another bpf_prog. So you don't
> > want to prevent it. You need other logic to detect if it was not suppose to
> > recurs.
> >  
> 
> If so, we have to keep the prog->active to prevent it, then I'm not
> sure if it is worth adding test_recursion_*().

I thought that the whole point of this exercise was because the
migrate_disable() itself could be traced (or call something that can), and
that's outside of prog->active protection. Which the test_recursion_*()
code was created for.

-- Steve