linux-kernel - Re: 2.6.27-rc5 doesn't boot on a Pavilion laptop

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Message-ID: <20080903160705.0efd7308@doriath.conectiva>
Date:	Wed, 3 Sep 2008 16:07:05 -0300
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Dmitry Nezhevenko <dion@...ex.net>, herton@...driva.com.br,
	Mikhail Kshevetskiy <mikhail.kshevetskiy@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.27-rc5 doesn't boot on a Pavilion laptop

Em Wed, 3 Sep 2008 20:40:55 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> escreveu:

| >  As the dmesg has various WARN_ON() outputs I'm attaching it, this is
| > the first one:
| > 
| > """
| > PCI: Using ACPI for IRQ routing
| > DMAR:parse DMAR table failure.
| > hpet0: at MMIO 0xfed00000, IRQs 2, 8, 31
| > hpet0: 3 32-bit timers, 25000000 Hz
| > Switched to high resolution mode on CPU 0
| >
| > tick_broadcast_set_event is stuck f09fa64 f0a01e4
| 
| Hmm, so we fail to force program that HPET with the standard minimum
| delta.
| 
| I now see why this is happening and it is happening only on systems
| with a fast HPET. Your's running 25MHz, so the delta is only 1.92
| usec. I was staring at lots of those bugreports without noticing the
| frequency.
| 
| Sigh. The idea to take a fixed number of HPET cycles as the minimum
| was not really brilliant it seems.
| 
| Does the patch below help ? Keep the debug patch applied, as we can
| see whether the check triggers or not.

 Yeah, it works. I have booted three times with no warnings.

 I will revert the debug patch and test again just to be sure, if
this is of any help:

Tested-by: Luiz Fernando N. Capitulino <lcapitulino@...driva.com.br>

 By the way, is this the definitive fix?

-- 
Luiz Fernando N. Capitulino
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