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Message-ID: <4AA145E6.8000603@zytor.com>
Date: Fri, 04 Sep 2009 09:52:54 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Jeremy Fitzhardinge <jeremy@...p.org>
CC: Tejun Heo <tj@...nel.org>, mingo@...hat.com,
linux-kernel@...r.kernel.org, jeremy.fitzhardinge@...rix.com,
stable@...nel.org, tglx@...utronix.de, mingo@...e.hu,
linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/asm] x86/i386: Make sure stack-protector segment base
is cache aligned
On 09/04/2009 09:01 AM, Jeremy Fitzhardinge wrote:
>>>
>> It's correct that it doesn't make any difference for access, only for load.
>>
>
> Well, to be completely precise, restore. When returning to usermode,
> the "pop %seg" is slightly faster if you're restoring a null selector,
> which is typically the case for %fs as 32-bit usermode doesn't use it.
>
That's a segment load...
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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