[PATCH 0/2] Save cpuhp dynamic state

From: Pierre Gondois
Date: Wed Sep 14 2022 - 12:31:36 EST


Requesting a CPUHP_AP_ONLINE_DYN cpuhp state reserves a state
among the range [CPUHP_AP_ONLINE_DYN:CPUHP_AP_ONLINE_DYN_END].
The reserved state must be saved in order to remove it later.

Cf. __cpuhp_setup_state_cpuslocked() documentation:
Return:
On success:
Positive state number if @state is CPUHP_AP_ONLINE_DYN;
0 for all other states

Indeed, the following:
cpuhp_remove_state(CPUHP_AP_ONLINE_DYN);
removes the first dynamic states added to the cpuhp state machine.

Patches were tested as:
- powercap/drivers/dtpm: on a Juno-r2, using a late_initcall()
to init and exit the dtpm framework.
- driver: soc: xilinx: the patch was only compile tested
due to missing hardware.

Pierre Gondois (2):
driver: soc: xilinx: Save cpuhp dynamic state
powercap/drivers/dtpm: Save cpuhp dynamic state

drivers/powercap/dtpm_cpu.c | 7 ++++++-
drivers/soc/xilinx/xlnx_event_manager.c | 12 ++++++++++--
2 files changed, 16 insertions(+), 3 deletions(-)

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2.25.1