linux-kernel - Re: [RESEND PATCH V6 1/4] cpufreq: exynos: Add cpufreq driver for exynos5440

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Date:	Fri, 12 Apr 2013 17:21:40 +0530
From:	amit daniel kachhap <amit.daniel@...sung.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Nishanth Menon <nm@...com>, Kukjin Kim <kgene.kim@...sung.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-pm@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>, cpufreq@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	Thomas Abraham <thomas.abraham@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Inderpal Singh <inderpal.singh@...aro.org>
Subject: Re: [RESEND PATCH V6 1/4] cpufreq: exynos: Add cpufreq driver for exynos5440

Hi Rafael,

On Fri, Apr 12, 2013 at 4:49 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Thursday, April 11, 2013 06:23:52 PM Nishanth Menon wrote:
>> Hi,
>> On Mon, Apr 8, 2013 at 4:57 AM, Amit Daniel Kachhap
>> <amit.daniel@...sung.com> wrote:
>> > +
>> > +static int init_div_table(void)
>> > +{
>> > +       struct cpufreq_frequency_table *freq_tbl = dvfs_info->freq_table;
>> > +       unsigned int tmp, clk_div, ema_div, freq, volt_id;
>> > +       int i = 0;
>> > +       struct opp *opp;
>> > +
>> > +       for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
>> > +
>> > +               opp = opp_find_freq_exact(dvfs_info->dev,
>> > +                                       freq_tbl[i].frequency * 1000, true);
>> > +               if (IS_ERR(opp)) {
>> > +                       dev_err(dvfs_info->dev,
>> > +                               "failed to find valid OPP for %u KHZ\n",
>> > +                               freq_tbl[i].frequency);
>> > +                       return PTR_ERR(opp);
>> > +               }
>> please use RCU read locks.
>>
>> > +
>> > +               freq = freq_tbl[i].frequency / 1000; /* In MHZ */
>> > +               clk_div = ((freq / CPU_DIV_FREQ_MAX) & P0_7_CPUCLKDEV_MASK)
>> > +                                       << P0_7_CPUCLKDEV_SHIFT;
>> > +               clk_div |= ((freq / CPU_ATB_FREQ_MAX) & P0_7_ATBCLKDEV_MASK)
>> > +                                       << P0_7_ATBCLKDEV_SHIFT;
>> > +               clk_div |= ((freq / CPU_DBG_FREQ_MAX) & P0_7_CSCLKDEV_MASK)
>> > +                                       << P0_7_CSCLKDEV_SHIFT;
>> > +
>> > +               /* Calculate EMA */
>> > +               volt_id = opp_get_voltage(opp);
>> Please use RCU read locks as documented for OPP library.
>
> Argh.  I overlooked that and the series has been applied already.  Care to send
> a fix against linux-pm.git/linux-next?

Will submit a patch with RCU lock changes.

Thanks,
Amit Daniel
>
> Rafael
>
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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