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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2025-09-05 15:44:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-19 16:37:30 +0200 |
| commit | 1f6a55e9ce453e36aaf293d0ec5929adf87e6b74 (patch) | |
| tree | fb47855fe6a7c72932f8b4bdab0bf6b48feda8ce /kernel/power/hibernate.c | |
| parent | 2878c584b192377cd52743fe21ea18614c57da87 (diff) | |
PM: EM: Add function for registering a PD without capacity update
commit e0423541477dfb684fbc6e6b5386054bc650f264 upstream.
The intel_pstate driver manages CPU capacity changes itself and it does
not need an update of the capacity of all CPUs in the system to be
carried out after registering a PD.
Moreover, in some configurations (for instance, an SMT-capable
hybrid x86 system booted with nosmt in the kernel command line) the
em_check_capacity_update() call at the end of em_dev_register_perf_domain()
always fails and reschedules itself to run once again in 1 s, so
effectively it runs in vain every 1 s forever.
To address this, introduce a new variant of em_dev_register_perf_domain(),
called em_dev_register_pd_no_update(), that does not invoke
em_check_capacity_update(), and make intel_pstate use it instead of the
original.
Fixes: 7b010f9b9061 ("cpufreq: intel_pstate: EAS support for hybrid platforms")
Closes: https://lore.kernel.org/linux-pm/40212796-734c-4140-8a85-854f72b8144d@panix.com/
Reported-by: Kenneth R. Crudup <kenny@panix.com>
Tested-by: Kenneth R. Crudup <kenny@panix.com>
Cc: 6.16+ <stable@vger.kernel.org> # 6.16+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/power/hibernate.c')
0 files changed, 0 insertions, 0 deletions