Re: [PATCH v5 bpf-next 2/3] bpf: introduce helper bpf_get_branch_snapshot

[Peter Zijlstra]

On Fri, Sep 03, 2021 at 10:10:16AM -0700, Andrii Nakryiko wrote:
> > I suppose you have to have this helper function because the JIT cannot
> > emit static_call()... although in this case one could cheat and simply
> > emit a call to static_call_query() and not bother with dynamic updates
> > (because there aren't any).
> 
> If that's safe, let's do it.

I'll try and remember to look into static_call_lock(), a means of
forever denying future static_call_update() calls. That should make this
more obvious.