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

From: Yinghai Lu
Date: Mon Oct 22 2012 - 15:46:28 EST

On Mon, Oct 22, 2012 at 11:38 AM, Jacob Shin <jacob.shin@xxxxxxx> 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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