linux-kernel - Re: [PATCH] cpufreq: stats: Convert to use sysfs_emit

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Message-ID: <CAJZ5v0gzMnjdyWpD4h7TsChwckUiKM_2z86TnUSjm_XLT3ENZw@mail.gmail.com>
Date:   Tue, 6 Dec 2022 12:28:12 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>, ye.xingchen@....com.cn
Cc:     rafael@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: stats: Convert to use sysfs_emit_at() API

On Tue, Dec 6, 2022 at 9:46 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 06-12-22, 16:15, ye.xingchen@....com.cn wrote:
> > From: ye xingchen <ye.xingchen@....com.cn>
> >
> > Follow the advice of the Documentation/filesystems/sysfs.rst and show()
> > should only use sysfs_emit() or sysfs_emit_at() when formatting the
> > value to be returned to user space.
> >
> > Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
> > ---
> >  drivers/cpufreq/cpufreq_stats.c | 16 +++++++---------
> >  1 file changed, 7 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
> > index 1570d6f3e75d..55c7ffd37d1c 100644
> > --- a/drivers/cpufreq/cpufreq_stats.c
> > +++ b/drivers/cpufreq/cpufreq_stats.c
> > @@ -128,25 +128,23 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
> >       ssize_t len = 0;
> >       int i, j, count;
> >
> > -     len += scnprintf(buf + len, PAGE_SIZE - len, "   From  :    To\n");
> > -     len += scnprintf(buf + len, PAGE_SIZE - len, "         : ");
> > +     len += sysfs_emit_at(buf, len, "   From  :    To\n");
> > +     len += sysfs_emit_at(buf, len, "         : ");
> >       for (i = 0; i < stats->state_num; i++) {
> >               if (len >= PAGE_SIZE)
> >                       break;
> > -             len += scnprintf(buf + len, PAGE_SIZE - len, "%9u ",
> > -                             stats->freq_table[i]);
> > +             len += sysfs_emit_at(buf, len, "%9u ", stats->freq_table[i]);
> >       }
> >       if (len >= PAGE_SIZE)
> >               return PAGE_SIZE;
> >
> > -     len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
> > +     len += sysfs_emit_at(buf, len, "\n");
> >
> >       for (i = 0; i < stats->state_num; i++) {
> >               if (len >= PAGE_SIZE)
> >                       break;
> >
> > -             len += scnprintf(buf + len, PAGE_SIZE - len, "%9u: ",
> > -                             stats->freq_table[i]);
> > +             len += sysfs_emit_at(buf, len, "%9u: ", stats->freq_table[i]);
> >
> >               for (j = 0; j < stats->state_num; j++) {
> >                       if (len >= PAGE_SIZE)
> > @@ -157,11 +155,11 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
> >                       else
> >                               count = stats->trans_table[i * stats->max_state + j];
> >
> > -                     len += scnprintf(buf + len, PAGE_SIZE - len, "%9u ", count);
> > +                     len += sysfs_emit_at(buf, len, "%9u ", count);
> >               }
> >               if (len >= PAGE_SIZE)
> >                       break;
> > -             len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
> > +             len += sysfs_emit_at(buf, len, "\n");
> >       }
> >
> >       if (len >= PAGE_SIZE) {
>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>
> --

Applied as 6.2 material, thanks!