linux-kernel - Re: [PATCH 0/3] x86: unify crash

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Message-ID: <47225F6C.5000708@ct.jp.nec.com>
Date:	Fri, 26 Oct 2007 14:43:08 -0700
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	vgoyal@...ibm.com, tglx@...utronix.de
Cc:	hbabu@...ibm.com, linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org
Subject: Re: [PATCH 0/3] x86: unify crash_32/64.c

> I'm now testing crash on 32bit, but there is an issue before
> applying the patches. My machine stopped at checking 'hlt'
> after kexec, showing below message.
> 
> CPU: Intel(R) Xeon(TM) CPU 3.80GHz stepping 0a
> Checking 'hlt' instruction...
> 
> v2.6.23.1 works fine for 1st kernel.
> I'm investigating it..

I found that the following patch makes my machine stopped.
bfe0c1cc6456bba1f4e3cc1fe29c0ea578ac763a
x86: HPET force enable for ICH5

It means that after applied this patch, HPET is enabled
automatically on 1st kernel and after crash/kexec the 2nd
kernel stopped at checking 'hlt'.

I also tested the latest kernel(2.6.24-rc1-gec3b67c1).
Boot parameter "nohpet" resolves this issue and kdump
works well on 32bit.
So I guess HPET affects this.
But I don't know why 64bit kernel with HPET is OK.

Thanks
Hiroshi Shimamoto
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