From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 31/31] memblock: Add memblock_find_in_range()
Date: Wed, 28 Jul 2010 12:58:44 -0700
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To: Yinghai Lu <yinghai@kernel.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>, Andrew Morton <akpm@linux-foundation.org>, David Miller <davem@davemloft.net>, Linus Torvalds <torvalds@linux-foundation.org>, Johannes Weiner <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Andrew Vasquez <andrew.vasquez@qlogic.com>

On 07/28/2010 12:27 PM, Yinghai Lu wrote:
>>
>> Yinghai, do you have any more detail, or know who would?  Also copying
>> the Qlogic Infinipath maintainer email...
> 
> when I was debug memblock with x86, found the strange crash when high/low.
> then use kexec with "memtest" in command line, and the early memtest does find
> some bad memory. 
> 
> then I add more print about EPT physical address for first kernel,
> it does show that range is used by qla driver in first kernel.
> I built all needed drivers in kernel so can pxeboot the kernel on all test platforms easily.
> 

[Cc: Andrew Vasquez, who seems to have written the offending code,
checkin df613b96077cee826b14089ae6e75eeabf71faa3.]

The question is still open why this particular DMA activity was not shut
down before the kexec.  I'm not familiar with how non-crashdump kexec
idles the hardware, but it obviously better do so.

	-hpa