linux-kernel - Re: [PATCH] thermal/cpufreq: increment i in cpufreq_get_requested

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Message-ID: <aT_H4m28SuAwuQzp@stanley.mountain>
Date: Mon, 15 Dec 2025 11:33:38 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Lukasz Luba <lukasz.luba@....com>
Cc: Amit Daniel Kachhap <amit.kachhap@...il.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] thermal/cpufreq: increment i in
 cpufreq_get_requested_power()

On Mon, May 06, 2024 at 10:41:52AM +0100, Lukasz Luba wrote:
> Hi Dan,
> 
> On 5/4/24 12:25, Dan Carpenter wrote:
> > We accidentally deleted the "i++" as part of a cleanup.  Restore it.
> > 
> > Fixes: 3f7ced7ac9af ("drivers/thermal/cpufreq_cooling : Refactor thermal_power_cpu_get_power tracing")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> > ---
> > This is based on static analysis and not tested.
> 
> Thank you for the patch. I have analyzed the code and why it
> haven't trigger an issue when I was testing it.
> 
> I looks like the function get_load() which is called above that 'i++'
> and takes the 'i' as the last argument is compiled in 2 versions:
> 1. for SMP system and the last argument 'cpu_idx' is ignored
> 2. for !SMP where we use the last argument 'cpu_idx' which is 'i'
> value. Although, for !SMP system we only have 1 cpu, thus the
> initialized 'int i = 0' at the beginning of that
> cpufreq_get_requested_power() is used correctly.
> The loop for !SMP goes only once.
> 
> > 
> >   drivers/thermal/cpufreq_cooling.c | 1 +
> >   1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
> > index 280071be30b1..a074192896de 100644
> > --- a/drivers/thermal/cpufreq_cooling.c
> > +++ b/drivers/thermal/cpufreq_cooling.c
> > @@ -249,6 +249,7 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
> >   			load = 0;
> >   		total_load += load;
> > +		i++;
> >   	}
> >   	cpufreq_cdev->last_load = total_load;
> 
> Would you agree that I will keep you as 'Reported-by' and send a
> separate patch to change that !SMP code completely in that
> get_load() function and get rid of the 'cpu_idx' argument?

Yes, please.

> Or I'm happy that you can develop such code and I can review it.
> It's up to you.

Happy to just get a Reported-by tag.

regards,
dan carpenter