On 11/29/2016 04:34 AM, Richard Cochran wrote:
> On Mon, Nov 28, 2016 at 05:03:36PM -0600, Grygorii Strashko wrote:
>> +static void cpts_calc_mult_shift(struct cpts *cpts)
>> +{
>> + u64 frac, maxsec, ns;
>> + u32 freq, mult, shift;
>> +
>> + freq = clk_get_rate(cpts->refclk);
>> +
>> + /* Calc the maximum number of seconds which we can run before
>> + * wrapping around.
>> + */
>> + maxsec = cpts->cc.mask;
>> + do_div(maxsec, freq);
>> + if (maxsec > 600 && cpts->cc.mask > UINT_MAX)
>> + maxsec = 600;
>
> The reason for this test is not obvious. Why check cc.mask against
> UINT_MAX? Please use the comment to explain it.
>
Yeah. This is copy paste from __clocksource_update_freq_scale(), but
I'm going to limit it to 10 sec for now, because otherwise it will result in too small
mult in case of 64bit counter.
if (maxsec > 10)
maxsec = 10;
--
regards,
-grygorii
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