From: Jeremy Fitzhardinge <jeremy@goop.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>,
mingo@redhat.com, linux-kernel@vger.kernel.org,
jeremy.fitzhardinge@citrix.com, stable@kernel.org,
tglx@linutronix.de, mingo@elte.hu,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/asm] x86/i386: Make sure stack-protector segment base is cache aligned
Date: Fri, 04 Sep 2009 09:57:30 -0700 [thread overview]
Message-ID: <4AA146FA.2000303@goop.org> (raw)
In-Reply-To: <4AA145E6.8000603@zytor.com>
On 09/04/09 09:52, H. Peter Anvin wrote:
> 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...
Yeah, OK.
J
prev parent reply other threads:[~2009-09-04 16:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-03 19:27 [PATCH] x86/i386: make sure stack-protector segment base is cache aligned Jeremy Fitzhardinge
2009-09-03 19:47 ` Eric Dumazet
2009-09-03 20:41 ` Jeremy Fitzhardinge
2009-09-03 21:07 ` Eric Dumazet
2009-09-03 21:31 ` Jeremy Fitzhardinge
2009-09-04 7:58 ` [tip:x86/asm] x86/i386: Put aligned stack-canary in percpu shared_aligned section tip-bot for Jeremy Fitzhardinge
2009-09-03 20:03 ` [tip:x86/asm] x86/i386: Make sure stack-protector segment base is cache aligned tip-bot for Jeremy Fitzhardinge
2009-09-03 20:26 ` H. Peter Anvin
2009-09-03 20:45 ` Jeremy Fitzhardinge
2009-09-03 21:15 ` H. Peter Anvin
2009-09-03 21:18 ` Ingo Molnar
2009-09-03 21:21 ` H. Peter Anvin
2009-09-04 14:15 ` Arjan van de Ven
2009-09-04 15:59 ` Jeremy Fitzhardinge
2009-09-04 16:06 ` H. Peter Anvin
2009-09-03 21:28 ` Jeremy Fitzhardinge
2009-09-04 2:51 ` Tejun Heo
2009-09-04 2:59 ` Tejun Heo
2009-09-04 3:35 ` H. Peter Anvin
2009-09-04 3:47 ` Tejun Heo
2009-09-04 3:51 ` H. Peter Anvin
2009-09-04 5:06 ` Tejun Heo
2009-09-04 5:12 ` Ingo Molnar
2009-09-04 16:04 ` Jeremy Fitzhardinge
2009-09-04 16:09 ` Tejun Heo
2009-09-04 16:13 ` H. Peter Anvin
2009-09-04 16:01 ` Jeremy Fitzhardinge
2009-09-04 16:52 ` H. Peter Anvin
2009-09-04 16:57 ` Jeremy Fitzhardinge [this message]
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