On Wed, Jan 30, 2019 at 11:32:43AM -0800, Alexei Starovoitov wrote:
> On Wed, Jan 30, 2019 at 11:10:58AM +0100, Peter Zijlstra wrote:
> > 
> > Why do you say this is not possible? All you need is 3 CPUs, one doing a
> > CPU online, one doing a perf ioctl() and one doing that
> > bpf_probe_register().
> 
> yeah. indeed. I'm impressed that lockdep figured it out
> while I missed it manually looking through the code and stack traces.

That's what it does :-)

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