Messages in this thread | | | Date | Tue, 19 Sep 2017 11:54:47 -0700 | From | Viresh Kumar <> | Subject | Re: [PATCH] cpufreq: cpufreq_stats: make last_index signed int |
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On 18-09-17, 10:39, Bo Yan wrote: > Currently, the "last_index" is being checked before > cpufreq_stats_update(stats) inside function > "cpufreq_stats_record_transition", so it's taken care of. > > However, the function "show_time_in_state" also calls cpufreq_stats_update, > the similar check should be done there too, like this:
Yeah, that's what I suggested.
> diff --git a/drivers/cpufreq/cpufreq_stats.c > b/drivers/cpufreq/cpufreq_stats.c > index e75880eb037d..15305b5ec322 100644 > --- a/drivers/cpufreq/cpufreq_stats.c > +++ b/drivers/cpufreq/cpufreq_stats.c > @@ -62,7 +62,8 @@ static ssize_t show_time_in_state(struct cpufreq_policy > *policy, char *buf) > if (policy->fast_switch_enabled) > return 0; > > - cpufreq_stats_update(stats); > + if ((int)stats->last_index >= 0)
You can rather do:
if (stats->last_index != -1)
> + cpufreq_stats_update(stats); > for (i = 0; i < stats->state_num; i++) { > len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i], > (unsigned long long) > > > This is only needed when policy->cur is not in frequency table when stats > table is created, in which case, stats->last_index will get -1, then user > does a "cat time_in_state" before any frequency transition. > > Does this make sense?
-- viresh
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