linux-kernel - Re: [GIT PULL] Additional x86 fixes for v3.8-rc1

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Message-ID: <de6b1419-6bbd-4ad2-8b1e-dc989c7beba5@email.android.com>
Date:	Wed, 19 Dec 2012 13:33:40 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	stable <stable@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Brown <mbrown@...systems.co.uk>,
	Ondrej Zary <linux@...nbow-software.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [GIT PULL] Additional x86 fixes for v3.8-rc1

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@...ux-foundation.org> wrote:

>On Wed, Dec 19, 2012 at 12:22 PM, H. Peter Anvin <hpa@...ux.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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