From: Andi Kleen <ak@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <ak@suse.de>, Gerd Knorr <kraxel@suse.de>,
Linus Torvalds <torvalds@osdl.org>, Dave Jones <davej@redhat.com>,
Zachary Amsden <zach@vmware.com>, Pavel Machek <pavel@ucw.cz>,
Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch] SMP alternatives
Date: Wed, 23 Nov 2005 17:39:06 +0100 [thread overview]
Message-ID: <20051123163906.GF20775@brahms.suse.de> (raw)
In-Reply-To: <1132764133.7268.51.camel@localhost.localdomain>
On Wed, Nov 23, 2005 at 04:42:13PM +0000, Alan Cox wrote:
> On Mer, 2005-11-23 at 12:17 -0700, Andi Kleen wrote:
> > > + /* Paranoia */
> > > + asm volatile ("jmp 1f\n1:");
> > > + mb();
> >
> > That would be totally obsolete 386 era paranoia. If anything then use
> > a CLFLUSH (but not available on all x86s)
>
> If you are patching code another x86 CPU is running you must halt the
> other processors and ensure it executes a serialzing instruction before
> it enters any patched code.
Yes that is why the original alternative() mechanism always only
runs before the code is ever executed.
> How many kilobytes of tables do you add to the kernel to do this
> pointless stunt btw ?
I much prefer the MSR bit too. Unfortunately it doesn't exist
(or rather I bet it exists somewhere, just undocumented) on Intel
systems.
-Andi
next prev parent reply other threads:[~2005-11-23 16:39 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-10 0:32 [PATCH 1/10] Cr4 is valid on some 486s Zachary Amsden
2005-11-11 10:36 ` Pavel Machek
2005-11-11 17:49 ` H. Peter Anvin
2005-11-11 18:00 ` Maciej W. Rozycki
2005-11-11 19:36 ` Zachary Amsden
2005-11-11 19:58 ` Linus Torvalds
2005-11-11 20:14 ` Zachary Amsden
2005-11-11 20:22 ` Linus Torvalds
2005-11-13 7:42 ` Dave Jones
2005-11-13 10:59 ` Andi Kleen
2005-11-13 17:26 ` Alan Cox
2005-11-13 17:09 ` Eric W. Biederman
2005-11-13 19:00 ` Andi Kleen
2005-11-13 19:07 ` Eric W. Biederman
2005-11-13 19:41 ` Alan Cox
2005-11-13 19:36 ` Linus Torvalds
2005-11-13 21:32 ` Alan Cox
2005-11-14 7:46 ` Arjan van de Ven
2005-11-13 19:56 ` H. Peter Anvin
2005-11-13 19:24 ` Linus Torvalds
2005-11-13 20:29 ` Linus Torvalds
2005-11-14 15:06 ` Gerd Knorr
2005-11-14 19:25 ` Linus Torvalds
2005-11-14 19:46 ` Zachary Amsden
2005-11-14 19:52 ` Arjan van de Ven
2005-11-14 20:34 ` Zachary Amsden
2005-11-14 20:52 ` Arjan van de Ven
2005-11-15 14:12 ` Gerd Knorr
2005-11-15 16:01 ` Gerd Knorr
2005-11-15 16:04 ` Zachary Amsden
2005-11-15 16:06 ` Arjan van de Ven
2005-11-15 16:10 ` Dave Jones
2005-11-15 16:14 ` H. Peter Anvin
2005-11-15 16:19 ` Dave Jones
2005-11-15 16:25 ` Arjan van de Ven
2005-11-15 16:34 ` Zachary Amsden
2005-11-15 16:28 ` H. Peter Anvin
2005-11-15 16:24 ` Zachary Amsden
2005-11-15 16:52 ` Linus Torvalds
2005-11-15 16:16 ` Gerd Knorr
2005-11-15 16:08 ` Roland Dreier
2005-11-16 9:58 ` Gerd Knorr
2005-11-15 16:12 ` Linus Torvalds
2005-11-15 16:16 ` Dave Jones
2005-11-15 16:27 ` Gerd Knorr
2005-11-16 16:12 ` [RFC] SMP alternatives Gerd Knorr
2005-11-22 17:48 ` [patch] " Gerd Knorr
2005-11-22 18:01 ` Pavel Machek
2005-11-23 15:12 ` Vincent Hanquez
2005-11-23 19:17 ` Andi Kleen
2005-11-23 15:29 ` Gerd Knorr
2005-11-23 16:42 ` Alan Cox
2005-11-23 16:39 ` Andi Kleen [this message]
2005-11-23 17:21 ` Alan Cox
2005-11-23 16:59 ` Andi Kleen
2005-11-23 22:00 ` Alan Cox
2005-11-24 13:13 ` Andi Kleen
2005-11-24 13:30 ` Eric W. Biederman
2005-11-24 13:39 ` Andi Kleen
2005-11-24 13:58 ` Eric W. Biederman
2005-11-24 19:16 ` thockin
2005-11-24 19:26 ` Andi Kleen
2005-11-24 14:34 ` Alan Cox
2005-11-24 14:22 ` Andi Kleen
2005-11-24 15:15 ` Alan Cox
2005-11-24 14:55 ` Andi Kleen
2005-11-24 15:09 ` Eric W. Biederman
2005-11-24 15:36 ` Andi Kleen
2005-11-24 16:49 ` Eric W. Biederman
2005-11-24 19:12 ` thockin
2005-11-24 19:14 ` Andi Kleen
2005-11-24 19:24 ` thockin
2005-11-24 19:29 ` Andi Kleen
2005-11-24 19:44 ` thockin
2005-11-24 21:20 ` Andi Kleen
2005-11-24 21:40 ` thockin
2005-11-24 23:33 ` Eric W. Biederman
2005-11-24 23:12 ` Alan Cox
2005-11-24 22:48 ` thockin
2005-11-24 23:35 ` Andi Kleen
2005-11-25 0:13 ` Alan Cox
2005-11-25 1:33 ` H. Peter Anvin
2005-11-28 19:15 ` Bill Davidsen
2005-11-24 16:02 ` Alan Cox
2005-11-24 19:09 ` thockin
2005-11-24 14:30 ` Alan Cox
2005-11-23 17:02 ` Linus Torvalds
2005-11-23 18:02 ` H. Peter Anvin
2005-11-23 18:42 ` Linus Torvalds
2005-11-23 17:26 ` Jeff V. Merkey
2005-11-23 19:03 ` Linus Torvalds
2005-11-23 19:31 ` jmerkey
2005-11-23 18:46 ` Andi Kleen
2005-11-23 19:12 ` H. Peter Anvin
2005-11-23 19:30 ` jmerkey
2005-11-23 21:44 ` Alan Cox
2005-11-23 21:13 ` Andi Kleen
2005-11-23 21:46 ` Jeff Garzik
2005-11-23 22:23 ` Andi Kleen
2005-11-23 22:30 ` Pavel Machek
2005-11-23 22:05 ` Alan Cox
2005-11-23 21:36 ` Arjan van de Ven
2005-11-23 21:36 ` Andi Kleen
2005-11-23 22:13 ` Linus Torvalds
2005-11-23 21:36 ` Linus Torvalds
2005-11-23 21:43 ` Andi Kleen
2005-11-23 22:15 ` Linus Torvalds
2005-11-23 22:22 ` Andi Kleen
2005-11-23 22:25 ` H. Peter Anvin
2005-11-23 22:32 ` Andi Kleen
2005-11-23 22:36 ` H. Peter Anvin
2005-11-23 22:40 ` Andi Kleen
2005-11-23 22:52 ` H. Peter Anvin
2005-11-23 23:10 ` Linus Torvalds
2005-11-24 0:55 ` Jeff Garzik
2005-11-23 21:48 ` Daniel Jacobowitz
2005-11-23 21:53 ` H. Peter Anvin
2005-11-23 22:03 ` Daniel Jacobowitz
2005-11-23 22:09 ` H. Peter Anvin
2005-11-23 22:21 ` Linus Torvalds
2005-11-23 23:29 ` Eric W. Biederman
2005-11-23 23:40 ` Linus Torvalds
2005-11-23 22:19 ` Linus Torvalds
2005-11-23 22:20 ` Daniel Jacobowitz
2005-11-23 23:08 ` Linus Torvalds
2005-11-23 23:02 ` Jeff V. Merkey
2005-11-23 23:42 ` Daniel Jacobowitz
2005-11-23 23:59 ` Linus Torvalds
2005-11-24 2:06 ` Daniel Jacobowitz
2005-11-24 22:32 ` Ulrich Drepper
2005-11-28 19:58 ` Bill Davidsen
2005-11-24 1:02 ` Jeff Garzik
2005-11-24 13:01 ` Pádraig Brady
2005-11-24 13:12 ` Arjan van de Ven
2005-11-28 19:52 ` Bill Davidsen
2005-11-28 20:05 ` Zachary Amsden
2005-11-28 22:19 ` Jeff V. Merkey
2005-11-28 23:00 ` Zachary Amsden
2005-11-28 23:07 ` H. Peter Anvin
2005-11-28 23:30 ` Zachary Amsden
2005-11-28 23:32 ` H. Peter Anvin
2005-11-28 23:12 ` Andi Kleen
2005-11-23 22:50 ` Alan Cox
2005-11-23 22:22 ` H. Peter Anvin
2005-11-25 7:38 ` Chris Wedgwood
2005-11-25 17:33 ` Linus Torvalds
2005-11-28 20:25 ` Bill Davidsen
2005-11-25 20:13 ` H. Peter Anvin
2005-11-24 3:23 ` Mikulas Patocka
2005-11-24 3:31 ` Mikulas Patocka
2005-11-24 3:55 ` H. Peter Anvin
2005-11-24 22:30 ` Ulrich Drepper
2005-11-23 16:43 ` Gerd Knorr
2005-11-23 16:51 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2005-11-24 17:48 linux
2005-11-24 18:48 ` Linus Torvalds
2005-11-24 18:24 colin
2006-01-24 15:33 [PATCH] " Gerd Hoffmann
2006-01-24 16:22 ` Ben Collins
2006-01-25 9:20 ` Gerd Hoffmann
2006-01-26 10:22 ` Pavel Machek
2006-01-26 11:17 ` Gerd Hoffmann
2006-01-26 11:48 ` Pavel Machek
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