linux-kernel - Re: bisected crash due to "x86: Move swiotlb initialization before dma32_free

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Date:	Tue, 15 Dec 2009 03:25:41 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	mingo@...e.hu, rdreier@...co.com, linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: bisected crash due to "x86: Move swiotlb initialization before
 dma32_free_bootmem"

FUJITA Tomonori wrote:
> On Tue, 15 Dec 2009 11:56:50 +0100
> Ingo Molnar <mingo@...e.hu> wrote:
> 
>> * FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
>>
>>> There are a few people who hit this. How many people use a box with over 
>>> 256GB memory?
>>>
>>> And you can work around this with "dma32_size" kernel boot option.
>> Well, since the kernel has not crashed before this change there's really just 
>> two options as per upstream kernel regression policy: either we fix it or we 
>> revert it.
> 
> As I wrote, here is a patch that can be applied to cleanly to the git
> head:
> 
> http://www.kernel.org/pub/linux/kernel/people/tomo/misc/0001-x86-two-stage-swiotlb-initialization.patch
> 
> It fixes the problem. Yinghai, can you test it? It should work but
> it's good to confirm it.

i tested already, it works.

> 
> I simply wanted to say that it's not a bug that breaks lots of boxes
> or leads to something serious like data corruption (no need to say
> something like "revert it now!"). It's also worth investigating why it
> breaks, I think.

will look at it later

YH

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