On Thu, Apr 06, 2023 at 11:16:07AM +0100, Jonathan Cameron wrote: > In the long run I agree it would be good. Short term there are more instances of > struct pmu that don't have parents than those that do (even after this series). > We need to figure out what to do about those before adding checks on it being > set. Right, I don't think you've touched *any* of the x86 PMUs for example, and getting everybody that boots an x86 kernel a warning isn't going to go over well :-)