On 3/23/21 6:55 PM, Rafael J. Wysocki wrote:
On Tue, Mar 23, 2021 at 4:57 PM Lukasz Luba <lukasz.l...@arm.com> wrote:
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 <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>
Thank you Greg!
Applied as 5.12-rc material, thanks!
Thank you Rafael!
Regards,
Lukasz
