linux-kernel - Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send

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Date:	Wed, 05 Jun 2013 10:30:00 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	Borislav Petkov <bp@...en8.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule,
 round 2

Hi, Jiri

On 06/05/2013 05:20 AM, Jiri Kosina wrote:
[snip]
> 
> Just to not let this thread sleep -- I am seeing this as well, even with 
> current Linus' tree (git HEAD == aa4f608).

Have you tried this:

diff --git a/drivers/cpufreq/cpufreq_governor.c
b/drivers/cpufreq/cpufreq_governor.c
index 443442d..449be88 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -26,6 +26,7 @@
 #include <linux/tick.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
+#include <linux/cpu.h>

 #include "cpufreq_governor.h"

@@ -180,8 +181,10 @@ void gov_queue_work(struct dbs_data *dbs_data,
struct cpufreq_policy *policy,
        if (!all_cpus) {
                __gov_queue_work(smp_processor_id(), dbs_data, delay);
        } else {
+               get_online_cpus();
                for_each_cpu(i, policy->cpus)
                        __gov_queue_work(i, dbs_data, delay);
+               put_online_cpus();
        }
 }
 EXPORT_SYMBOL_GPL(gov_queue_work);

Does it works?

Regards,
Michael Wang

> 

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