Re: [PATCH 01/32] perf: Allow a PMU to have a parent

[Peter Zijlstra]

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 :-)