linux-kernel - Re: [BUG] warning at kernel/cpu.c:38/lock_cpu

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Message-Id: <200609231236.40547.caglar@pardus.org.tr>
Date:	Sat, 23 Sep 2006 12:36:34 +0300
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	Dave Jones <davej@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] warning at kernel/cpu.c:38/lock_cpu_hotplug()

23 Eyl 2006 Cts 02:13 tarihinde, Dave Jones şunları yazmıştı: 
> On Sat, Sep 23, 2006 at 01:45:16AM +0300, S.Çağlar Onur wrote:
>  > Hi;
>  >
>  > With kernel-2.6.18, "modprobe cpufreq_stats" always (i can reproduce)
>  > gaves following;
>  >
>  > ...
>  > Lukewarm IQ detected in hotplug locking
>  > BUG: warning at kernel/cpu.c:38/lock_cpu_hotplug()
>  >  [<b0134a42>] lock_cpu_hotplug+0x42/0x65
>  >  [<b02f8af1>] cpufreq_update_policy+0x25/0xad
>  >  [<b0358756>] kprobe_flush_task+0x18/0x40
>  >  [<b0355aab>] schedule+0x63f/0x68b
>  >  [<b01377c2>] __link_module+0x0/0x1f
>  >  [<b0119e7d>] __cond_resched+0x16/0x34
>  >  [<b03560bf>] cond_resched+0x26/0x31
>  >  [<b0355b0e>] wait_for_completion+0x17/0xb1
>  >  [<f965c547>] cpufreq_stat_cpu_callback+0x13/0x20 [cpufreq_stats]
>  >  [<f9670074>] cpufreq_stats_init+0x74/0x8b [cpufreq_stats]
>  >  [<b0137872>] sys_init_module+0x91/0x174
>  >  [<b0102c81>] sysenter_past_esp+0x56/0x79
>
> This should do the trick.
> I'll merge the same patch into cpufreq.git
>
> 		Dave

Ill try

> --- linux-2.6.18.noarch/drivers/cpufreq/cpufreq_stats.c~	2006-09-22
> 19:12:57.000000000 -0400 +++
> linux-2.6.18.noarch/drivers/cpufreq/cpufreq_stats.c	2006-09-22
> 19:13:03.000000000 -0400 @@ -350,12 +350,10 @@ __init
> cpufreq_stats_init(void)
>  	}
>
>  	register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
> -	lock_cpu_hotplug();
>  	for_each_online_cpu(cpu) {
>  		cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE,
>  			(void *)(long)cpu);
>  	}
> -	unlock_cpu_hotplug();
>  	return 0;
>  }
>  static void

What about cpufreq_stats_exit, it has same locking? Seems like rmmod may cause 
same problem or im totaly wrong?

Cheer
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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