On Tue, Mar 23, 2021 at 02:56:08PM +0000, Lukasz Luba wrote: > The debugfs directory '/sys/kernel/debug/energy_model' is needed before > the Energy Model registration can happen. With the recent change in > debugfs subsystem it's not allowed to create this directory at early stage > (core_initcall). Thus creating this directory would fail. > Postpone the creation of the EM debug dir to later stage: fs_initcall. > It should be safe since all clients: CPUFreq drivers, Devfreq drivers will > be initialized in later stages. > The custom debug log below prints the time of creation the EM debug dir at > fs_initcall and successful registration of EMs at later stages. > > [ 1.505717] energy_model: creating rootdir > [ 3.698307] cpu cpu0: EM: created perf domain > [ 3.709022] cpu cpu1: EM: created perf domain > > fixes: 56348560d495 ("debugfs: do not attempt to create a new file before the > filesystem is initalized") > Reported-by: Ionela Voinescu <ionela.voine...@arm.com> > Signed-off-by: Lukasz Luba <lukasz.l...@arm.com> > --- > Hi Rafael, > > Please take this patch into your PM v5.12 fixes. The change described in > the patch above landed in v5.12-rc1. Some of our EAS/EM tests are failing.
Reviewed-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>