On 3/23/21 3:26 PM, Greg KH wrote:
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 <[email protected]> Signed-off-by: Lukasz Luba <[email protected]> --- 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 <[email protected]>
Thank you Greg! Regards, Lukasz
