From: "Ville Syrjälä" <syrjala@sci.fi>
To: Dave Airlie <airlied@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Jan Kara <jack@suse.cz>,
Greg KH <greg@kroah.com>, Anders Larsen <al@alarsen.net>,
dri-devel@lists.freedesktop.org,
ksummit-2010-discuss@lists.linux-foundation.org,
Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>,
codalist@telemann.coda.cs.cmu.edu,
Theodore Kilgore <kilgota@banach.math.auburn.edu>,
Bryan Schumaker <bjschuma@netapp.com>,
Christoph Hellwig <hch@infradead.org>,
Petr Vandrovec <vandrove@vc.cvut.cz>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
linux-media@vger.kernel.org, Samuel Ortiz <samuel@sortiz.org>,
Evgeniy Dushistov <dushistov@mail.ru>,
Steven Rostedt <rostedt@goodmis.org>,
autofs@linux.kernel.org, Jan Harkes <jaharkes@cs.cmu.edu>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
Andrew Hendry <andrew.hendry@gmail.com>
Subject: Re: [Ksummit-2010-discuss] [v2] Remaining BKL users, what to do
Date: Wed, 20 Oct 2010 19:14:55 +0300 [thread overview]
Message-ID: <20101020161455.GC24313@sci.fi> (raw)
In-Reply-To: <AANLkTinw=Wzh2Ucj6zKSoqC8J3Yq9xDr3mKMUB7K6Yyo@mail.gmail.com>
On Wed, Oct 20, 2010 at 06:50:58AM +1000, Dave Airlie wrote:
> On Tue, Oct 19, 2010 at 11:26 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Tuesday 19 October 2010, Arnd Bergmann wrote:
> >> On Tuesday 19 October 2010 06:52:32 Dave Airlie wrote:
> >> > > I might be able to find some hardware still lying around here that uses an
> >> > > i810. Not sure unless I go hunting it. But I get the impression that if
> >> > > the kernel is a single-CPU kernel there is not any problem anyway? Don't
> >> > > distros offer a non-smp kernel as an installation option in case the user
> >> > > needs it? So in reality how big a problem is this?
> >> >
> >> > Not anymore, which is my old point of making a fuss. Nowadays in the
> >> > modern distro world, we supply a single kernel that can at runtime
> >> > decide if its running on SMP or UP and rewrite the text section
> >> > appropriately with locks etc. Its like magic, and something like
> >> > marking drivers as BROKEN_ON_SMP at compile time is really wrong when
> >> > what you want now is a runtime warning if someone tries to hotplug a
> >> > CPU with a known iffy driver loaded or if someone tries to load the
> >> > driver when we are already in SMP mode.
> >>
> >> We could make the driver run-time non-SMP by adding
> >>
> >> if (num_present_cpus() > 1) {
> >> pr_err("i810 no longer supports SMP\n");
> >> return -EINVAL;
> >> }
> >>
> >> to the init function. That would cover the vast majority of the
> >> users of i810 hardware, I guess.
> >
> > Some research showed that Intel never support i810/i815 SMP setups,
> > but there was indeed one company (http://www.acorpusa.com at the time,
> > now owned by a domain squatter) that made i815E based dual Pentium-III
> > boards like this one: http://cgi.ebay.com/280319795096
>
> Also that board has no on-board GPU enabled i815EP (P means no on-board GPU).
A quick search seems to indicate that an i815E variant also existed.
--
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/
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WARNING: multiple messages have this Message-ID (diff)
From: "Ville Syrjälä" <syrjala@sci.fi>
To: Dave Airlie <airlied@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Jan Kara <jack@suse.cz>,
Greg KH <greg@kroah.com>, Anders Larsen <al@alarsen.net>,
dri-devel@lists.freedesktop.org,
ksummit-2010-discuss@lists.linux-foundation.org,
Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>,
codalist@telemann.coda.cs.cmu.edu,
Theodore Kilgore <kilgota@banach.math.auburn.edu>,
Bryan Schumaker <bjschuma@netapp.com>,
Christoph Hellwig <hch@infradead.org>,
Petr Vandrovec <vandrove@vc.cvut.cz>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
linux-media@vger.kernel.org, Samuel Ortiz <samuel@sortiz.org>,
Evgeniy Dushistov <dushistov@mail.ru>,
Steven Rostedt <rostedt@goodmis.org>,
autofs@linux.kernel.org, Jan Harkes <jaharkes@cs.cmu.edu>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
Andrew Hendry <andrew.hendry@gmail.com>
Subject: Re: [Ksummit-2010-discuss] [v2] Remaining BKL users, what to do
Date: Wed, 20 Oct 2010 19:14:55 +0300 [thread overview]
Message-ID: <20101020161455.GC24313@sci.fi> (raw)
In-Reply-To: <AANLkTinw=Wzh2Ucj6zKSoqC8J3Yq9xDr3mKMUB7K6Yyo@mail.gmail.com>
On Wed, Oct 20, 2010 at 06:50:58AM +1000, Dave Airlie wrote:
> On Tue, Oct 19, 2010 at 11:26 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Tuesday 19 October 2010, Arnd Bergmann wrote:
> >> On Tuesday 19 October 2010 06:52:32 Dave Airlie wrote:
> >> > > I might be able to find some hardware still lying around here that uses an
> >> > > i810. Not sure unless I go hunting it. But I get the impression that if
> >> > > the kernel is a single-CPU kernel there is not any problem anyway? Don't
> >> > > distros offer a non-smp kernel as an installation option in case the user
> >> > > needs it? So in reality how big a problem is this?
> >> >
> >> > Not anymore, which is my old point of making a fuss. Nowadays in the
> >> > modern distro world, we supply a single kernel that can at runtime
> >> > decide if its running on SMP or UP and rewrite the text section
> >> > appropriately with locks etc. Its like magic, and something like
> >> > marking drivers as BROKEN_ON_SMP at compile time is really wrong when
> >> > what you want now is a runtime warning if someone tries to hotplug a
> >> > CPU with a known iffy driver loaded or if someone tries to load the
> >> > driver when we are already in SMP mode.
> >>
> >> We could make the driver run-time non-SMP by adding
> >>
> >> if (num_present_cpus() > 1) {
> >> pr_err("i810 no longer supports SMP\n");
> >> return -EINVAL;
> >> }
> >>
> >> to the init function. That would cover the vast majority of the
> >> users of i810 hardware, I guess.
> >
> > Some research showed that Intel never support i810/i815 SMP setups,
> > but there was indeed one company (http://www.acorpusa.com at the time,
> > now owned by a domain squatter) that made i815E based dual Pentium-III
> > boards like this one: http://cgi.ebay.com/280319795096
>
> Also that board has no on-board GPU enabled i815EP (P means no on-board GPU).
A quick search seems to indicate that an i815E variant also existed.
--
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/
next prev parent reply other threads:[~2010-10-20 16:14 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-16 14:32 Remaining BKL users, what to do Arnd Bergmann
2010-09-16 14:32 ` Arnd Bergmann
2010-09-16 14:49 ` Steven Rostedt
2010-09-16 14:49 ` Steven Rostedt
2010-09-16 18:32 ` Jens Axboe
2010-09-16 18:32 ` Jens Axboe
2010-09-17 18:46 ` Arnd Bergmann
2010-09-17 18:46 ` Arnd Bergmann
2010-09-17 18:46 ` Arnd Bergmann
2010-09-16 15:04 ` Jan Kara
2010-09-16 15:04 ` Jan Kara
2010-09-16 21:26 ` Anton Altaparmakov
2010-09-16 21:26 ` Anton Altaparmakov
2010-09-17 10:45 ` Arnd Bergmann
2010-09-17 10:45 ` Arnd Bergmann
2010-09-17 13:32 ` Christoph Hellwig
2010-09-17 13:32 ` Christoph Hellwig
2010-09-17 13:50 ` Arnd Bergmann
2010-09-17 13:50 ` Arnd Bergmann
2010-09-17 14:02 ` Christoph Hellwig
2010-09-17 14:02 ` Christoph Hellwig
2010-09-17 14:56 ` Arnd Bergmann
2010-09-17 14:56 ` Arnd Bergmann
2010-09-17 19:00 ` [PATCH] BKL: Remove BKL from isofs Arnd Bergmann
2010-09-20 10:58 ` Jan Kara
2010-09-20 11:13 ` Arnd Bergmann
2010-09-20 15:18 ` Jan Kara
2010-09-20 15:40 ` Alexander E. Patrakov
2010-09-20 15:50 ` Jan Kara
2010-09-16 15:07 ` Remaining BKL users, what to do Alan Cox
2010-09-16 20:08 ` David Miller
2010-09-16 16:09 ` Anders Larsen
2010-09-16 16:09 ` Anders Larsen
2010-09-16 16:57 ` Samuel Ortiz
2010-09-16 16:57 ` Samuel Ortiz
2010-09-16 20:08 ` David Miller
2010-09-16 20:08 ` David Miller
2010-09-16 19:00 ` Jan Harkes
2010-09-16 19:26 ` Arnd Bergmann
2010-09-20 1:25 ` [autofs] " Ian Kent
2010-10-18 15:42 ` [v2] " Arnd Bergmann
2010-10-18 15:42 ` Arnd Bergmann
2010-10-18 16:19 ` Christoph Hellwig
2010-10-18 16:19 ` Christoph Hellwig
2010-10-18 17:38 ` Arnd Bergmann
2010-10-18 17:38 ` Arnd Bergmann
2010-10-18 18:43 ` [Ksummit-2010-discuss] " Greg KH
2010-10-18 23:00 ` Dave Airlie
2010-10-19 0:40 ` Greg KH
2010-10-19 0:57 ` Dave Airlie
2010-10-19 2:24 ` Greg KH
2010-10-19 2:45 ` Dave Airlie
2010-10-19 3:33 ` Steven Rostedt
2010-10-19 4:03 ` Dave Airlie
2010-10-19 4:03 ` Dave Airlie
2010-10-19 5:00 ` Theodore Kilgore
2010-10-19 4:52 ` Dave Airlie
2010-10-19 7:26 ` Arnd Bergmann
2010-10-19 12:39 ` Steven Rostedt
2010-10-19 13:36 ` Arnd Bergmann
2010-10-19 13:36 ` Arnd Bergmann
2010-10-19 13:43 ` Steven Rostedt
2010-10-19 13:57 ` Arnd Bergmann
2010-10-19 13:57 ` Arnd Bergmann
2010-10-19 13:54 ` Paul Mundt
2010-10-19 13:26 ` Arnd Bergmann
2010-10-19 20:50 ` Dave Airlie
2010-10-19 20:50 ` Dave Airlie
2010-10-20 16:14 ` Ville Syrjälä [this message]
2010-10-20 16:14 ` Ville Syrjälä
2010-10-19 18:24 ` Valdis.Kletnieks
2010-10-19 19:37 ` Greg KH
2010-10-19 19:40 ` Oliver Neukum
2010-10-19 20:29 ` Greg KH
2010-10-19 20:38 ` Jiri Kosina
2010-10-19 20:41 ` Alan Cox
2010-10-19 20:48 ` Arnd Bergmann
2010-10-19 20:44 ` Arnd Bergmann
2010-10-20 4:43 ` Dave Young
2010-10-20 6:50 ` Arnd Bergmann
2010-11-02 1:21 ` Pavel Machek
2010-11-03 6:58 ` Pekka Enberg
2010-11-05 2:27 ` Arnd Bergmann
2010-11-05 7:14 ` Pekka Enberg
2010-10-21 12:42 ` Christoph Hellwig
2010-10-21 12:42 ` Christoph Hellwig
2010-10-21 12:47 ` Christoph Hellwig
2010-10-21 13:38 ` Arnd Bergmann
2010-10-21 13:50 ` [PATCH 1/2] BKL: remove BKL from qnx4 Arnd Bergmann
2010-10-21 15:22 ` Anders Larsen
2010-10-21 13:51 ` [PATCH 2/2] BKL: remove BKL from freevxfs Arnd Bergmann
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