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authorLukasz Luba <lukasz.luba@arm.com>2021-03-23 17:56:08 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-03-23 21:53:48 +0300
commitfb9d62b27ab1e07d625591549c314b7d406d21df (patch)
tree9d7fc2e6c5bdbed03d36e78060a00637884180fa /kernel/power
parent0d02ec6b3136c73c09e7859f0d0e4e2c4c07b49b (diff)
downloadlinux-fb9d62b27ab1e07d625591549c314b7d406d21df.tar.xz
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>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/energy_model.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index 1358fa4abfa8..0f4530b3a8cd 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -98,7 +98,7 @@ static int __init em_debug_init(void)
return 0;
}
-core_initcall(em_debug_init);
+fs_initcall(em_debug_init);
#else /* CONFIG_DEBUG_FS */
static void em_debug_create_pd(struct device *dev) {}
static void em_debug_remove_pd(struct device *dev) {}