linux-kernel - Re: BUG: 1bbbbe7 (x86: Exclude E820_RESERVED regions...) PANIC on boot

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Message-ID: <CAE9FiQWZmwa6EwsfZzz_e3A-tz2LUS2+i+zh4zpXpR_Jj_FQ1w@mail.gmail.com>
Date:	Mon, 22 Oct 2012 12:46:36 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jacob Shin <jacob.shin@....com>
Cc:	Tom Rini <trini@...com>, hpa@...or.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: BUG: 1bbbbe7 (x86: Exclude E820_RESERVED regions...) PANIC on boot

On Mon, Oct 22, 2012 at 11:38 AM, Jacob Shin <jacob.shin@....com> wrote:
>
> Does EFI do this on above 4G memory? All the EFI BIOSes we have in house looked
> to be only touching under 4G.

I have no idea about it.

>
>>
>> 2. partial page:
>>    E820 or user could pass memmap that  is not page aligned.
>>    old cold will guarded by max_low_pfn and max_pfn. so the end partial
>>    page will be trimmed down, and memblock can one use it.
>>    middle partial page will still get covered by directly mapping, and
>> memblock still can use them.
>>    Now we will not map middle partial page and memblock still try to use it
>> we could get panic when accessing those pages.
>>
>> So I would suggest to just revert that temporary patch at this time,
>> and later come out one complete patch for stable kernels.
>
> Hm okay, I was hoping not, but if it has to be ..

It's hpa's call.
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