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Date: Fri, 22 Sep 2006 19:13:42 -0400
From: Dave Jones <davej@redhat.com>
To: =?utf-8?B?Uy7Dh2HEn2xhcg==?= Onur <caglar@pardus.org.tr>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [BUG] warning at kernel/cpu.c:38/lock_cpu_hotplug()
Message-ID: <20060922231342.GA8414@redhat.com>
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	=?utf-8?B?Uy7Dh2HEn2xhcg==?= Onur <caglar@pardus.org.tr>,
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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

--- 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

-- 
http://www.codemonkey.org.uk
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