From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andi Kleen <ak@muc.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: any chance of 2.6.0-test*?
Date: 11 Jan 2003 14:39:59 +0000 [thread overview]
Message-ID: <1042295999.2517.10.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <m3iswv27o3.fsf@averell.firstfloor.org>
On Sat, 2003-01-11 at 12:27, Andi Kleen wrote:
> Can you quickly summarize what is broken with IDE ?
> Are just some low level drivers broken or are there some generic
> nasty problems.
>
> If it is just some broken low level drivers I guess they can
> be marked dangerous or CONFIG_EXPERIMENTAL.
Low level drivers are basically sorted.
The main problems are
- Incorrect locking all over the place
- Incorrect timings on some phases
- Some ioctls can cause crashes due to locking
- ISAPnP IDE doesn't work right now
- Flaws in error recovery paths in certain situations
- Lots of random oopses on boot/remove that were apparently
introduced by the kobject/sysfs people and need chasing
down. (There are some non sysfs ones mostly fixed)
- ide-scsi needs some cleanup to fix switchover ide-cd/scsi
(We can't dump ide-scsi)
- Unregister path has races which cause all the long
standing problems with pcmcia and prevents pci unreg
- PCI IDE driver registration needs busy checks
- PCI layer needs some stuff from 2.4
- PCI layer in 2.4/2.5 needs an IRQ bug fixing
- ACPI doesn't seem to handle compatibility IRQ mode
- We don't handle a few errata (MWDMA on 450NX for example)
- IDE raid hasn't been ported to 2.5 at all yet
Thats off the top of my head right now.
> How does it differ from the code that was just merged into 2.4.21pre3
> (has the later all the problems fixed?)
No, although some don't show up in the same ways in 2.4 - eg the pcmcia
unload race is rare in 2.4 for other reasons. Endianism should all
be cured in 2.4, and I sent that to Linus. The PCI i/o assignment code
in 2.4 is done. I hope to have some of the locking and also the timing
path work Ross Biro has done in for 2.4.22 proper
> > broken and nobody has even started fixing it. Just try a mass of parallel
> > tty/pty activity . It was problematic before, pre-empt has taken it to dead,
> > defunct and buried.
>
> Can someone shortly describe what is the main problem with TTY?
>
> >From what I can see the high level tty code mostly takes lock_kernel
> before doing anything.
Which works really well with all the IRQ paths on it
> On reads access to file->private_data is not serialized, but it at
> least shouldn't go away because VFS takes care of struct file
> reference counting.
The refcounting bugs are/were in the ldisc stuff. I thought the
bluetooth folks (Max and co) fixed that one
If we can lock_kernel the tty layer for now (I'm bothered about
the ldisc end of tht which is IRQ context) then great, tty scaling
is suddenelly a 2.7 problem.
next prev parent reply other threads:[~2003-01-11 13:45 UTC|newest]
Thread overview: 196+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20030110165441$1a8a@gated-at.bofh.it>
[not found] ` <20030110165505$38d9@gated-at.bofh.it>
2003-01-11 12:27 ` any chance of 2.6.0-test*? Andi Kleen
2003-01-11 13:01 ` Russell King
2003-01-11 13:13 ` Andi Kleen
2003-01-11 14:39 ` Alan Cox [this message]
2003-01-11 14:06 ` Andi Kleen
2003-01-11 15:31 ` Alan Cox
2003-01-11 15:25 ` Andi Kleen
2003-01-11 19:18 ` Alan Cox
2003-01-13 3:33 ` Paul Mackerras
2003-01-13 14:59 ` Alan Cox
2003-01-13 18:36 ` Benjamin Herrenschmidt
2003-01-14 2:32 ` ide-cs problem (was Re: any chance of 2.6.0-test*?) Paul Mackerras
2003-01-19 16:05 ` any chance of 2.6.0-test*? Pavel Machek
[not found] ` <20030112094007$1647@gated-at.bofh.it>
2003-01-12 9:56 ` Fixing the tty layer was " Andi Kleen
2003-01-13 6:41 ` Dipankar Sarma
2003-01-13 7:25 ` Andi Kleen
2003-01-13 8:12 ` Dipankar Sarma
2003-01-13 9:15 ` Russell King
2003-01-13 9:36 ` Dipankar Sarma
2003-01-13 6:45 ` Greg KH
[not found] <20030113001006$005c@gated-at.bofh.it>
[not found] ` <20030113005007$4766@gated-at.bofh.it>
[not found] ` <20030113170014$20a1@gated-at.bofh.it>
2003-01-18 10:21 ` Kai Henningsen
[not found] <20030112193012$71b2@gated-at.bofh.it>
[not found] ` <20030113020015$6883@gated-at.bofh.it>
[not found] ` <20030113023015$66a6@gated-at.bofh.it>
[not found] ` <20030113030011$6563@gated-at.bofh.it>
[not found] ` <20030113035007$451e@gated-at.bofh.it>
2003-01-14 20:18 ` Kai Henningsen
[not found] <20030112205008$7a5d@gated-at.bofh.it>
[not found] ` <20030113112009$52fd@gated-at.bofh.it>
[not found] ` <20030113144017$68de@gated-at.bofh.it>
2003-01-14 20:01 ` Kai Henningsen
[not found] <20030112201009$1534@gated-at.bofh.it>
[not found] ` <20030112204005$7287@gated-at.bofh.it>
2003-01-14 19:53 ` Kai Henningsen
2003-01-15 15:07 ` Scott Robert Ladd
2003-01-15 15:18 ` Marcelo Pacheco
2003-01-18 10:12 ` Kai Henningsen
2003-01-15 19:44 ` Werner Almesberger
2003-01-13 22:37 Albert D. Cahalan
-- strict thread matches above, loose matches on Subject: below --
2003-01-13 20:37 Manfred Spraul
[not found] <3C6BEE8B5E1BAC42905A93F13004E8AB017DE60F@mailse01.axis.se>
2003-01-12 20:58 ` Rob Wilkens
2003-01-12 18:02 David Truog
[not found] <20030110144325.T26554@parcelfarce.linux.theplanet.co.uk>
[not found] ` <20030110.130023.08256524.davem@redhat.com>
2003-01-10 21:48 ` Matthew Wilcox
2003-01-10 16:39 Shawn Starr
2003-01-10 17:00 ` Dave Jones
2003-01-11 20:10 ` Horst von Brand
2003-01-10 16:10 William Lee Irwin III
2003-01-10 16:28 ` Dave Jones
2003-01-10 16:41 ` Zwane Mwaikambo
2003-01-10 17:08 ` Dave Jones
2003-01-10 17:19 ` Alan Cox
2003-01-10 16:40 ` Jeff Garzik
2003-01-10 17:06 ` Dave Jones
2003-01-10 17:25 ` Jeff Garzik
2003-01-10 17:29 ` Linus Torvalds
2003-01-10 18:47 ` J.A. Magallon
2003-01-10 19:37 ` Matthew D. Pitts
2003-01-10 19:51 ` Jeff Garzik
2003-01-14 1:39 ` James H. Cloos Jr.
2003-01-10 18:16 ` Alan Cox
2003-01-10 17:37 ` Jochen Friedrich
2003-01-10 17:38 ` Linus Torvalds
2003-01-12 9:27 ` Greg KH
2003-01-12 16:55 ` Alan Cox
2003-01-12 17:05 ` Linus Torvalds
2003-01-12 17:17 ` Christoph Hellwig
2003-01-12 19:15 ` Linus Torvalds
2003-01-12 19:34 ` Rob Wilkens
2003-01-12 19:37 ` Rob Wilkens
2003-01-12 19:53 ` Tomas Szepe
2003-01-12 20:03 ` Rob Wilkens
2003-01-13 15:43 ` Terje Eggestad
2003-01-13 15:49 ` Jens Axboe
2003-01-13 16:25 ` Terje Eggestad
2003-01-13 16:26 ` Jens Axboe
2003-01-13 16:41 ` Terje Eggestad
2003-01-13 16:43 ` Jens Axboe
2003-01-13 17:00 ` Zwane Mwaikambo
2003-01-13 18:48 ` Jens Axboe
2003-01-13 22:14 ` Keith Owens
2003-01-13 22:42 ` John Levon
2003-01-13 22:49 ` Zwane Mwaikambo
2003-01-13 23:32 ` Valdis.Kletnieks
2003-01-13 23:43 ` Zwane Mwaikambo
2003-01-12 20:44 ` Alan Cox
2003-01-12 20:45 ` William Lee Irwin III
2003-01-13 13:14 ` Bernd Schmidt
2003-01-12 21:22 ` David Woodhouse
2003-01-18 13:04 ` Folkert van Heusden
2003-01-12 19:38 ` Linus Torvalds
2003-01-12 19:59 ` Rob Wilkens
2003-01-12 20:18 ` Valdis.Kletnieks
2003-01-12 20:23 ` yodaiken
2003-01-12 20:26 ` Tomas Szepe
2003-01-12 20:32 ` Sean Neakums
2003-01-12 20:51 ` Valdis.Kletnieks
2003-01-13 0:54 ` Randy Dunlap
2003-01-12 20:46 ` Kevin Puetz
2003-01-13 0:48 ` Randy Dunlap
2003-01-18 13:07 ` Folkert van Heusden
2003-01-12 20:20 ` David Ford
2003-01-12 20:22 ` Linus Torvalds
2003-01-12 20:33 ` Robert Love
2003-01-12 20:33 ` Linus Torvalds
2003-01-13 10:54 ` Horst von Brand
2003-01-13 11:09 ` Eric W. Biederman
2003-01-13 14:34 ` Terje Eggestad
2003-01-13 23:23 ` Bob Taylor
2003-01-12 20:48 ` Rob Wilkens
2003-01-12 20:59 ` Dimitrie O. Paun
2003-01-13 11:07 ` Helge Hafting
2003-01-13 3:30 ` yodaiken
2003-01-12 21:29 ` Rik van Riel
2003-01-13 0:03 ` Scott Robert Ladd
2003-01-13 0:38 ` Rob Wilkens
2003-01-13 16:51 ` Emiliano Gabrielli
2003-01-13 0:38 ` Randy Dunlap
2003-01-12 19:41 ` Christoph Hellwig
2003-01-12 19:41 ` Rob Wilkens
2003-01-12 19:58 ` David Ford
2003-01-12 20:07 ` Rob Wilkens
2003-01-12 20:31 ` Oliver Neukum
2003-01-12 20:34 ` David Ford
2003-01-12 20:31 ` Robert Love
2003-01-12 21:02 ` Rob Wilkens
2003-01-12 21:15 ` Matti Aarnio
2003-01-12 21:27 ` Rob Wilkens
2003-01-12 21:40 ` Rik van Riel
2003-01-12 21:44 ` Rob Wilkens
2003-01-12 21:49 ` Aaron Lehmann
2003-01-12 22:07 ` Rob Wilkens
2003-01-12 22:18 ` Aaron Lehmann
2003-01-12 22:34 ` Rob Wilkens
2003-01-12 22:52 ` Aaron Lehmann
2003-01-12 23:11 ` Rob Wilkens
2003-01-12 23:31 ` Oliver Neukum
2003-01-12 23:39 ` Emiliano Gabrielli
2003-01-12 23:46 ` Rob Wilkens
2003-01-12 23:57 ` Emiliano Gabrielli
2003-01-13 0:08 ` Rob Wilkens
2003-01-13 16:02 ` Terje Eggestad
2003-01-12 22:53 ` Sean Neakums
2003-01-12 23:06 ` Oliver Neukum
2003-01-12 23:48 ` Rik van Riel
2003-01-12 21:58 ` Emiliano Gabrielli
2003-01-12 22:12 ` Rob Wilkens
2003-01-12 22:29 ` Olivier Galibert
2003-01-12 23:21 ` Alan Cox
2003-01-12 22:12 ` Oliver Neukum
2003-01-12 22:18 ` Aaron Lehmann
2003-01-12 22:35 ` Rob Wilkens
2003-01-13 8:15 ` Jens Axboe
2003-01-12 21:49 ` David Ford
2003-01-12 21:59 ` Adam Kropelin
2003-01-12 22:21 ` Rob Wilkens
2003-01-12 22:33 ` Tomas Szepe
2003-01-12 22:36 ` Emiliano Gabrielli
2003-01-12 22:38 ` Oliver Neukum
2003-01-12 22:42 ` romieu
2003-01-13 1:06 ` Randy Dunlap
2003-01-13 1:21 ` Rob Wilkens
2003-01-13 1:51 ` Nuno Monteiro
2003-01-13 2:19 ` Rob Wilkens
2003-01-13 2:51 ` Marcelo Pacheco
2003-01-13 3:37 ` Rob Wilkens
2003-01-13 4:53 ` Billy Rose
2003-01-13 3:06 ` Jochen Striepe
2003-01-13 3:40 ` Rob Wilkens
2003-01-13 9:45 ` Matti Aarnio
2003-01-13 3:48 ` Ryan Anderson
2003-01-13 4:37 ` Billy Rose
2003-01-12 22:06 ` Oliver Neukum
2003-01-12 22:22 ` Rob Wilkens
2003-01-12 22:43 ` Oliver Neukum
2003-01-12 22:51 ` Rob Wilkens
2003-01-12 23:00 ` Robert Love
2003-01-12 23:16 ` Rob Wilkens
2003-01-12 23:16 ` Nicolas Pitre
2003-01-12 23:05 ` Emiliano Gabrielli
2003-01-12 23:23 ` Oliver Neukum
2003-01-12 23:45 ` Emiliano Gabrielli
2003-01-12 23:45 ` Emiliano Gabrielli
2003-01-13 20:01 ` Horst von Brand
2003-01-12 23:16 ` Oliver Neukum
2003-01-13 2:00 ` Ryan Anderson
2003-01-13 3:09 ` Rob Wilkens
2003-01-14 2:13 ` Rik van Riel
2003-01-12 22:58 ` Robert Love
2003-01-12 22:28 ` Matti Aarnio
2003-01-13 1:26 ` David Lang
2003-01-13 2:00 ` William Lee Irwin III
2003-01-13 22:02 ` Val Henson
2003-01-13 13:08 ` Dave Jones
2003-01-13 13:40 ` Andrew Walrond
2003-01-13 13:49 ` Oliver Neukum
2003-01-14 6:52 ` Bruce Harada
2003-01-14 7:12 ` Brian Tinsley
2003-01-13 15:23 ` Richard B. Johnson
2003-01-13 6:23 ` Greg KH
2003-01-13 16:35 ` Linus Torvalds
2003-01-13 18:33 ` Alan Cox
2003-01-13 18:01 ` Linus Torvalds
2003-01-13 19:17 ` Andrew McGregor
2003-01-12 17:37 ` Russell King
2003-01-13 1:08 ` Michael Kingsbury
2003-01-13 1:52 ` William Lee Irwin III
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