linux-kernel - Re: [PATCH v4 16/22] cpupower: add the function to get the sysfs value from specific table

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Message-ID: <YZsDQBzfuW51LT+t@hr-amd>
Date:   Mon, 22 Nov 2021 10:41:04 +0800
From:   Huang Rui <ray.huang@....com>
To:     Juuso Alasuutari <juuso.alasuutari@...il.com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>
Cc:     "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "bp@...e.de" <bp@...e.de>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "ggherdovich@...e.cz" <ggherdovich@...e.cz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "skhan@...uxfoundation.org" <skhan@...uxfoundation.org>,
        "steven@...vesoftware.com" <steven@...vesoftware.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v4 16/22] cpupower: add the function to get the sysfs
 value from specific table

On Sat, Nov 20, 2021 at 06:19:43AM +0800, Juuso Alasuutari wrote:
> On Fri, 19 Nov 2021 14:38:58 -0600, Nathan Fontenot wrote:
> > On 11/19/21 4:30 AM, Huang Rui wrote:
> > > Expose the helper into cpufreq header, then cpufreq driver can use this
> > > function to get the sysfs value if it has any specific sysfs interfaces.
> > > 
> > > Signed-off-by: Huang Rui <ray.huang@....com>
> > > ---
> > >  tools/power/cpupower/lib/cpufreq.c | 21 +++++++++++++++------
> > >  tools/power/cpupower/lib/cpufreq.h | 12 ++++++++++++
> > >  2 files changed, 27 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/tools/power/cpupower/lib/cpufreq.c b/tools/power/cpupower/lib/cpufreq.c
> > > index c3b56db8b921..02719cc400a1 100644
> > > --- a/tools/power/cpupower/lib/cpufreq.c
> > > +++ b/tools/power/cpupower/lib/cpufreq.c
> > > @@ -83,20 +83,21 @@ static const char *cpufreq_value_files[MAX_CPUFREQ_VALUE_READ_FILES] = {
> > >  	[STATS_NUM_TRANSITIONS] = "stats/total_trans"
> > >  };
> > >  
> > > -
> > > -static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
> > > -						 enum cpufreq_value which)
> > > +unsigned long cpufreq_get_sysfs_value_from_table(unsigned int cpu,
> > > +						 const char **table,
> > > +						 unsigned index,
> > > +						 unsigned size)
> > >  {
> > >  	unsigned long value;
> > >  	unsigned int len;
> > >  	char linebuf[MAX_LINE_LEN];
> > >  	char *endp;
> > >  
> > > -	if (which >= MAX_CPUFREQ_VALUE_READ_FILES)
> > > +	if (!table && !table[index] && index >= size)
> > 
> > Should you validate the index before accessing table[index]
> > 
> >         if (!table && index >= size && !table[index])
> 
> The operator is wrong as well. I believe this is what was originally intended:
> 
> 	if (!table || index >= size || !table[index])

Yes, nice catch. Thanks. Updated it.

Thanks,
Ray