linux-kernel - [PATCH 1/2] PM: EM: Fix incorrect description of the cost field in struct em_perf

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Message-Id: <20251230061534.816894-1-tianyaxiong@kylinos.cn>
Date: Tue, 30 Dec 2025 14:15:34 +0800
From: Yaxiong Tian <tianyaxiong@...inos.cn>
To: lukasz.luba@....com,
	rafael@...nel.org,
	pavel@...nel.org,
	lenb@...nel.org
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yaxiong Tian <tianyaxiong@...inos.cn>
Subject: [PATCH 1/2] PM: EM: Fix incorrect description of the cost field in struct em_perf_state

Due to commit 1b600da51073 ("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.

Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
---
 include/linux/energy_model.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
index 43aa6153dc57..e7497f804644 100644
--- a/include/linux/energy_model.h
+++ b/include/linux/energy_model.h
@@ -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 {
-- 
2.25.1