linux-kernel - Re: WARNING: at arch/x86/kernel/hpet.c:404 hpet_next

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Date:	Wed, 10 Mar 2010 09:28:01 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Pedro M. López <pmlopez@...timensaje.es>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: WARNING: at arch/x86/kernel/hpet.c:404 hpet_next_event+0x57/0x77()

On Wed, Mar 10, 2010 at 1:01 AM, Pedro M. López <pmlopez@...timensaje.es> wrote:
> Kernel 2.6.33
>
> [    1.200658] ------------[ cut here ]------------
> [    1.200662] WARNING: at arch/x86/kernel/hpet.c:404 hpet_next_event+0x57/0x77()
> [    1.200663] Hardware name: P55A-UD4
> [    1.200664] hpet: compare register read back failed.
> [    1.200665] Modules linked in:
> [    1.200666] Pid: 0, comm: swapper Not tainted 2.6.33-p1 #10
> [    1.200668] Call Trace:
> [    1.200671]  [<ffffffff8102c98f>] ? warn_slowpath_common+0x76/0x8c
> [    1.200673]  [<ffffffff8102c9f7>] ? warn_slowpath_fmt+0x40/0x45
> [    1.200676]  [<ffffffff81026166>] ? find_busiest_group+0x341/0x7fe
> [    1.200678]  [<ffffffff81018eb1>] ? hpet_next_event+0x57/0x77
> [    1.200681]  [<ffffffff81048d1e>] ? tick_dev_program_event+0x33/0x9e
> [    1.200684]  [<ffffffff81048836>] ?
> tick_broadcast_oneshot_control+0x9c/0xf5
> [    1.200686]  [<ffffffff81048220>] ? tick_notify+0x1f9/0x34d
> [    1.200688]  [<ffffffff8104257a>] ? notifier_call_chain+0x2e/0x5b
> [    1.200690]  [<ffffffff81047c56>] ? clockevents_notify+0x31/0x139
> [    1.200693]  [<ffffffff81175aa0>] ? acpi_idle_enter_simple+0x93/0x130
> [    1.200696]  [<ffffffff811673c3>] ?
> acpi_write_bit_register+0x9e/0xab
> [    1.200698]  [<ffffffff8117585c>] ? acpi_idle_enter_bm+0xd3/0x284
> [    1.200701]  [<ffffffff811f2705>] ? cpuidle_idle_call+0x89/0xc0
> [    1.200704]  [<ffffffff81001256>] ? cpu_idle+0x9d/0xd7
> [    1.200707] ---[ end trace a4e806103d58b3e6 ]---
>
> More info need??

Known issue with that hardware::
http://bugzilla.kernel.org/show_bug.cgi?id=14996

There's a patch that quiets the warnings on its way to mainline.

thanks
-john
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