[PATCH 6.12 013/139] PM: EM: Fix incorrect description of the cost field in struct em_perf_state
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2026-01-21 18:17:39
Also in:
linux-patches
Subsystem:
energy model, the rest · Maintainers:
Lukasz Luba, "Rafael J. Wysocki", Linus Torvalds
6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yaxiong Tian <redacted>
[ Upstream commit 54b603f2db6b95495bc33a8f2bde80f044baff9a ]
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.
Fixes: 1b600da51073 ("PM: EM: Optimize em_cpu_energy() and remove division")
Signed-off-by: Yaxiong Tian <redacted>
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 <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 34498652f7802..09ce3dc4eab5c 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 {
--
2.51.0