linux-kernel - Re: [PATCH] cpufreq: conservative: Simplify the condition of storing 'down

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Date:   Fri, 6 Oct 2023 21:56:20 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Liao Chang <liaochang1@...wei.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: conservative: Simplify the condition of storing 'down_threshold'

On Thu, Oct 5, 2023 at 12:59 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 12-09-23, 06:09, Liao Chang wrote:
> > The governor currently checks if the input new down_threshold is less
> > than 100 before storing it. However, the up_threshold field of dbs_data
> > structure is also limited to be less than 100, so this check is
> > unnecessary and remove it.
> >
> > Signed-off-by: Liao Chang <liaochang1@...wei.com>
> > ---
> >  drivers/cpufreq/cpufreq_conservative.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
> > index b6bd0ff35323..56500b25d77c 100644
> > --- a/drivers/cpufreq/cpufreq_conservative.c
> > +++ b/drivers/cpufreq/cpufreq_conservative.c
> > @@ -187,8 +187,7 @@ static ssize_t down_threshold_store(struct gov_attr_set *attr_set,
> >       ret = sscanf(buf, "%u", &input);
> >
> >       /* cannot be lower than 1 otherwise freq will not fall */
> > -     if (ret != 1 || input < 1 || input > 100 ||
> > -                     input >= dbs_data->up_threshold)
> > +     if (ret != 1 || input < 1 || input >= dbs_data->up_threshold)
> >               return -EINVAL;
> >
> >       cs_tuners->down_threshold = input;
>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

Applied as 6.7 material, thanks!