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Date: Fri, 24 Jan 2020 10:29:03 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, Javi Merino <javi.merino@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>, Eduardo Valentin <edubezval@...il.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 373/639] thermal: cpu_cooling: Actually trace CPU load in thermal_power_cpu_get_power From: Matthias Kaehlcke <mka@...omium.org> [ Upstream commit bf45ac18b78038e43af3c1a273cae4ab5704d2ce ] The CPU load values passed to the thermal_power_cpu_get_power tracepoint are zero for all CPUs, unless, unless the thermal_power_cpu_limit tracepoint is enabled too: irq/41-rockchip-98 [000] .... 290.972410: thermal_power_cpu_get_power: cpus=0000000f freq=1800000 load={{0x0,0x0,0x0,0x0}} dynamic_power=4815 vs irq/41-rockchip-96 [000] .... 95.773585: thermal_power_cpu_get_power: cpus=0000000f freq=1800000 load={{0x56,0x64,0x64,0x5e}} dynamic_power=4959 irq/41-rockchip-96 [000] .... 95.773596: thermal_power_cpu_limit: cpus=0000000f freq=408000 cdev_state=10 power=416 There seems to be no good reason for omitting the CPU load information depending on another tracepoint. My guess is that the intention was to check whether thermal_power_cpu_get_power is (still) enabled, however 'load_cpu != NULL' already indicates that it was at least enabled when cpufreq_get_requested_power() was entered, there seems little gain from omitting the assignment if the tracepoint was just disabled, so just remove the check. Fixes: 6828a4711f99 ("thermal: add trace events to the power allocator governor") Signed-off-by: Matthias Kaehlcke <mka@...omium.org> Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org> Acked-by: Javi Merino <javi.merino@...nel.org> Acked-by: Viresh Kumar <viresh.kumar@...aro.org> Signed-off-by: Eduardo Valentin <edubezval@...il.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/thermal/cpu_cooling.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index dfd23245f778a..9df6b72604667 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -458,7 +458,7 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, load = 0; total_load += load; - if (trace_thermal_power_cpu_limit_enabled() && load_cpu) + if (load_cpu) load_cpu[i] = load; i++; -- 2.20.1
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