Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page tables if in mixed-mode

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On 02/02/2017 03:36 PM, Laura Abbott wrote:
> On 02/02/2017 12:17 PM, Joseph Salisbury wrote:
>> Hi Matt,
>>
>> A kernel bug report was opened against Ubuntu [0].  After a kernel
>> bisect, it was found that reverting the following commit resolved this bug:
>>
>> commit 1297667083d5442aafe3e337b9413bf02b114edb
>> Author: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
>> Date:   Mon Sep 19 13:09:09 2016 +0100
>>
>>     x86/efi: Only map RAM into EFI page tables if in mixed-mode
>>
>>
>> The regression was introduced as of v4.8-rc8.  It also still affects
>> current mainline.
>>
>> I was hoping to get your feedback, since you are the patch author.  Do
>> you think gathering any additional data will help diagnose this issue,
>> or would it be best to submit a revert request?
>>
>>
>> Thanks,
>>
>> Joe
>>
>> [0] http://pad.lv/1659340
>>
>>
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> You might try https://marc.info/?l=linux-kernel&m=148553171703761
> which fixed https://bugzilla.redhat.com/show_bug.cgi?id=1384238
>
> Thanks,
> Laura

This patch resolves the bug for multiple users.  Thanks again for the
pointer, Laura and Ard!


Joe

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