Commit 54b603f2 authored Dec 30, 2025 by Yaxiong Tian Committed by Rafael J. Wysocki Jan 08, 2026

PM: EM: Fix incorrect description of the cost field in struct em_perf_state



Due to commit 1b600da5 ("PM: EM: Optimize em_cpu_energy() and remove
division"), the logic for energy consumption calculation has been modified.
The actual calculation of cost is 10 * power * max_frequency / frequency
instead of power * max_frequency / frequency.

Therefore, the comment for cost has been updated to reflect the correct
content.

Fixes: 1b600da5 ("PM: EM: Optimize em_cpu_energy() and remove division")
Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
[ rjw: Added Fixes: tag ]
Link: https://patch.msgid.link/20251230061534.816894-1-tianyaxiong@kylinos.cn


Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 9ace4753

include/linux/energy_model.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -18,7 +18,7 @@
		* @power: The power consumed at this level (by 1 CPU or by a registered
		* device). It can be a total power: static and dynamic.
		* @cost: The cost coefficient associated with this level, used during
		* energy calculation. Equal to: power * max_frequency / frequency
		* energy calculation. Equal to: 10 * power * max_frequency / frequency
		* @flags: see "em_perf_state flags" description below.
		*/
		struct em_perf_state {