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Subject: Re: [GIT PULL] Additional x86 fixes for v3.8-rc1
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 19 Dec 2012 13:33:40 -0800
To: Linus Torvalds <torvalds@linux-foundation.org>,
        "H. Peter Anvin" <hpa@linux.intel.com>
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        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
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Well, A20 has been done inside the caches since 486, usually in the TLB.  Nehalem finally killed off A20M.

You're not the only one surprised by this...

Linus Torvalds <torvalds@linux-foundation.org> wrote:

>On Wed, Dec 19, 2012 at 12:22 PM, H. Peter Anvin <hpa@linux.intel.com>
>wrote:
>>       x86, 8042: Enable A20 using KBC to fix S3 resume on some MSI
>laptops
>
>Christ really? What century are we in? There are still machines that
>have A20 disabled at all, much less externally? How do they even do
>that these days, afaik the CPU caches can't handle the fake aliasing
>anyway..
>
>Anyway, pulled, I just wanted to express my surprise..
>
>          Linus

-- 
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