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Date:	Wed, 11 Nov 2009 14:50:16 -0500
From:	Dave Jones <davej@...hat.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.31.4: WARNING: at arch/x86/kernel/hpet.c:390
 hpet_next_event+0x70/0x80()

On Sun, Nov 08, 2009 at 09:35:33AM -0500, Justin Piszcz wrote:
 > Motherboard: Intel DP55KG
 > BIOS: 3878P (latest as of 11/08/09)
 > 
 > When CPUFREQ is compiled in the kernel:
 > 
 > [    3.377946]  [<ffffffff81043180>] ? hpet_next_event+0x70/0x80
 > [    3.377947]  [<ffffffff81043180>] ? hpet_next_event+0x70/0x80
 > [    3.377950]  [<ffffffff810564d4>] ? warn_slowpath_common+0x74/0xd0
 > [    3.377952]  [<ffffffff81043180>] ? hpet_next_event+0x70/0x80
 > [    3.377954]  [<ffffffff81076fd6>] ? tick_dev_program_event+0x36/0xb0
 > [    3.377956]  [<ffffffff810769b9>] ? tick_broadcast_oneshot_control+0x119/0x120
 > [    3.377957]  [<ffffffff8107617d>] ? tick_notify+0x22d/0x420
 > [    3.377960]  [<ffffffff8106f737>] ? notifier_call_chain+0x37/0x70
 > [    3.377961]  [<ffffffff81075a6b>] ? clockevents_notify+0x2b/0x90
 > [    3.377964]  [<ffffffff812438a8>] ? acpi_idle_enter_bm+0x15f/0x2d3
 > [    3.377966]  [<ffffffff8124373e>] ? acpi_idle_enter_c1+0xf1/0xfc
 > [    3.377969]  [<ffffffff812e84ea>] ? cpuidle_idle_call+0xba/0x120
 > [    3.377972]  [<ffffffff8102b830>] ? cpu_idle+0x60/0xa0
 > [    3.377975] ---[ end trace 222f8db6d7ba1b9b ]---
 
This also happens if cpufreq is a module ?
There's no cpufreq code in that trace, so I'm puzzled.

 > [    3.883303] cpufreq-core: trying to register driver acpi-cpufreq
 > [    3.883305] cpufreq-core: adding CPU 0
 > [    3.883348] cpufreq-core: initialization failed
 > [    3.883349] cpufreq-core: adding CPU 1
 > [    3.883390] cpufreq-core: initialization failed
 > [    3.883391] cpufreq-core: adding CPU 2
 > [    3.883432] cpufreq-core: initialization failed
 > [    3.883433] cpufreq-core: adding CPU 3
 > [    3.883473] cpufreq-core: initialization failed
 > [    3.883474] cpufreq-core: adding CPU 4
 > [    3.883515] cpufreq-core: initialization failed
 > [    3.883516] cpufreq-core: adding CPU 5
 > [    3.883556] cpufreq-core: initialization failed
 > [    3.883557] cpufreq-core: adding CPU 6
 > [    3.883598] cpufreq-core: initialization failed
 > [    3.883599] cpufreq-core: adding CPU 7
 > [    3.883639] cpufreq-core: initialization failed
 > [    3.883640] cpufreq-core: no CPU initialized for driver acpi-cpufreq

Does acpi-cpufreq work when built as a module ?
If it does, seeing the differences in output from booting with cpufreq.debug=7
might yield some clues.

	Dave

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