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authorLukasz Luba <lukasz.luba@arm.com>2021-03-23 15:56:08 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-03-23 19:53:48 +0100
commitfb9d62b27ab1e07d625591549c314b7d406d21df (patch)
tree9d7fc2e6c5bdbed03d36e78060a00637884180fa /.clang-format
parentLinux 5.12-rc4 (diff)
downloadlinux-fb9d62b27ab1e07d625591549c314b7d406d21df.tar.xz
linux-fb9d62b27ab1e07d625591549c314b7d406d21df.zip
PM: EM: postpone creating the debugfs dir till fs_initcall
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.voinescu@arm.com> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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