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Message-ID: <4918593.31r3eYUQgx@kreacher>
Date: Mon, 15 Jan 2024 18:55:13 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, Lukasz Luba <lukasz.luba@....com>, Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH v1 1/2] thermal: gov_fair_share: Fix dependency on trip points ordering
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
The computation in the fair share governor's get_trip_level() function
currently works under the assumption that the temperature ordering of
trips[] in a thermal zone is ascending, which need not be the case.
However, get_trip_level() can be made work regardless of whether or not
the trips table is ordered by temperature in any way, so change it
accordingly.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/thermal/gov_fair_share.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
Index: linux-pm/drivers/thermal/gov_fair_share.c
===================================================================
--- linux-pm.orig/drivers/thermal/gov_fair_share.c
+++ linux-pm/drivers/thermal/gov_fair_share.c
@@ -18,22 +18,24 @@
static int get_trip_level(struct thermal_zone_device *tz)
{
const struct thermal_trip *trip, *level_trip = NULL;
- int trip_level;
+ int trip_level = -1;
for_each_trip(tz, trip) {
if (trip->temperature >= tz->temperature)
- break;
+ continue;
- level_trip = trip;
+ trip_level++;
+
+ if (!level_trip || trip->temperature > level_trip->temperature)
+ level_trip = trip;
}
/* Bail out if the temperature is not greater than any trips. */
- if (!level_trip)
+ if (trip_level < 0)
return 0;
- trip_level = thermal_zone_trip_id(tz, level_trip);
-
- trace_thermal_zone_trip(tz, trip_level, level_trip->type);
+ trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, level_trip),
+ level_trip->type);
return trip_level;
}
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