Hi, Bartlomiej
On 07/08/2013 11:26 PM, Bartlomiej Zolnierkiewicz wrote:
[snip]
>
> # echo 0 > /sys/devices/system/cpu/cpu3/online
> # echo 0 > /sys/devices/system/cpu/cpu2/online
> # echo 0 > /sys/devices/system/cpu/cpu1/online
> # while true;do echo 1 > /sys/devices/system/cpu/cpu1/online;echo 0 >
> /sys/devices/system/cpu/cpu1/online;done
>
> The commit in question (2f7021a8) was merged in v3.10-rc5 as a fix for
> commit 031299b ("cpufreq: governors: Avoid unnecessary per cpu timer
> interrupts") which was causing a kernel warning to show up.
>
> Michael/Viresh: do you have some idea how to fix the issue?
Thanks for the report :) would you like to take a try
on below patch and see whether it solve the issue?
diff --git a/drivers/cpufreq/cpufreq_governor.c
b/drivers/cpufreq/cpufreq_governor.c
index 5af40ad..aa05eaa 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -229,6 +229,8 @@ static void set_sampling_rate(struct dbs_data *dbs_data,
}
}
+static struct lock_class_key j_cdbs_key;
+
int cpufreq_governor_dbs(struct cpufreq_policy *policy,
struct common_dbs_data *cdata, unsigned int event)
{
@@ -366,6 +368,8 @@ int (struct cpufreq_policy *policy,
kcpustat_cpu(j).cpustat[CPUTIME_NICE];
mutex_init(&j_cdbs->timer_mutex);
+ lockdep_set_class(&j_cdbs->timer_mutex, &j_cdbs_key);
+
INIT_DEFERRABLE_WORK(&j_cdbs->work,
dbs_data->cdata->gov_dbs_timer);
}
Regards,
Michael Wang
>
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
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