linux-kernel - Re: [tip:x86/urgent] x86/PAT: Fix Xorg regression on CPUs that don't support PAT

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Date:   Thu, 1 Jun 2017 17:49:25 +1000
From:   Ian W MORRISON <ianwmorrison@...il.com>
To:     Doug Smythies <dsmythies@...us.net>
Cc:     Bernhard Held <berny156@....de>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86/PAT: Fix Xorg regression on CPUs that don't
 support PAT

On 31 May 2017 at 10:53, Doug Smythies <dsmythies@...us.net> wrote:
> Note Before:
> I might not have the address list correct, as I have re-created this
> e-mail from the web page archive, having found the thread after bisecting the
> kernel.
>
> On 2017.05.29 18:50:57 -0400 (EDT) Mikulas Patocka wrote:
>> On Sun, 28 May 2017, Andy Lutomirski wrote:
>>> On Sun, May 28, 2017 at 11:18 AM, Bernhard Held <berny156@....de> wrote:
>>>> Hi,
>>>>
>>>> this patch breaks the boot of my kernel. The last message is "Booting
>>>> the kernel.".
>
> It breaks my kernel boot also, and I know of at least two others with
> the same, or similar, problem as of kernel 4.12-rc3.
>

Just to add that I cannot boot v4.12-rc3 kernel with any Intel Atom
(BYT and CHT) Intel Compute Sticks. Adding 'earlyprintk=efi' confirms
kernel panic with
[ 0.000000] Kernel panic - not syncing: x86/PAT: PAT enabled, but not
supported by secondary CPU


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