Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S933039AbeAKURh (ORCPT <rfc822;ralf@linux-mips.org> + 1 other);
        Thu, 11 Jan 2018 15:17:37 -0500
Received: from mail-it0-f68.google.com ([209.85.214.68]:46745 "EHLO
        mail-it0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S932437AbeAKURe (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 11 Jan 2018 15:17:34 -0500
X-Google-Smtp-Source: ACJfBosd9j0W6d1p5Wq+NRfyZmAkcH0Pq9PBv2onTaHb+YbA1i3TOSjZelqW6q/rsupFEG20UYX1LiztHE27QzAiXaI=
MIME-Version: 1.0
In-Reply-To: <20180111201006.GA29756@kroah.com>
References: <CAOAebxuqK4TOktLrHNLdW-S3oSxVO2og84js7N5u_QDC7mE2Ow@mail.gmail.com>
 <20180105204557.GA8839@kroah.com> <a93f30d1-e00e-419b-532d-203be16e2299@oracle.com>
 <20180107104540.GB14783@kroah.com> <CAOAebxsBVTyS2gSXh4c-g1b8Lvjv9MBG3Wjr_AC+LJpMLHRqEA@mail.gmail.com>
 <CAOAebxsP1LLV-Eg_h8brbxfsn_tpRDR46yrVZeokrFt3ArRuMA@mail.gmail.com>
 <20180108074645.GA24062@kroah.com> <CAOAebxu_gGE5chc-Mn=zBo_M3ojExvooNfvFRWOT=FygoffjLQ@mail.gmail.com>
 <CAOAebxuecMGOVe4zfNgk+t3mXVnDaWVA-GLdb+HiX3t9LNnxLg@mail.gmail.com>
 <CAOAebxu-OY-sxEZVzOkrG0iVG92ACiMNWk9xXVqZjj8kO5gp3A@mail.gmail.com> <20180111201006.GA29756@kroah.com>
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 11 Jan 2018 12:17:31 -0800
X-Google-Sender-Auth: C7SfsY8DoNG6-zYPRz9J4ueAXJQ
Message-ID: <CA+55aFyJ0tBPEjiqx43dTZ-o3Ab3DR_HCKUKEOWiafzFSpvn5A@mail.gmail.com>
Subject: Re: [PATCH 4.4 00/37] 4.4.110-stable review
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>,
        Andy Lutomirski <luto@kernel.org>,
        Hugh Dickins <hughd@google.com>, Thomas Voegtle <tv@lio96.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Shuah Khan <shuahkh@osg.samsung.com>, patches@kernelci.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        lkft-triage@lists.linaro.org, stable <stable@vger.kernel.org>,
        Steve Sistare <steven.sistare@oracle.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Return-Path: <linux-kernel-owner@vger.kernel.org>

On Thu, Jan 11, 2018 at 12:10 PM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> Nice, but why does this not show up in 4.9 and 4.14 and Linus's tree as
> well on this hardware?  Nor on the SLES12 SP3 kernel?
>
> What is different there that 4.4 requires?  That worries me more than
> your fix (which looks good to me, fwiw.)

I really think it's simply that since v4.6, we've had commit
67a9108ed431 ("x86/efi: Build our own page table structures"), so no
normal EFI use actually uses the old legacy mapping unless you passed
in "efi=old_map" on the kernel command line.

So the bug is there in all versions, it's just that it's normally only
noticeable in 4.4.

But I might be missing some other difference, so take that with a pinch of salt.

             Linus