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From: Pavel Machek <pavel@ucw.cz>
To: Nigel Cunningham <ncunningham@crca.org.au>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
	Alan Stern <stern@rowland.harvard.edu>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Jens Axboe <jens.axboe@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-pm <linux-pm@lists.linux-foundation.org>,
	Matt Reimer <mattjreimer@gmail.com>
Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while userspace is frozen?
Date: Mon, 24 May 2010 21:02:07 +0200	[thread overview]
Message-ID: <20100524190206.GL1292@ucw.cz> (raw)
In-Reply-To: <4BF1C86B.8000203@crca.org.au>


> >>- We're dealing with the symptom, not the cause. Almost always a bad idea.
> >
> >I very much prefer to have a fix for a symptom than no fix at all, which is the
> >realistic alternative in this case.
> >
> >So, I think we should merge the patch and if someone finds the root cause
> >at one point in future, then we can just use the *right* approach instead of
> >the present one.
> >
> >The problem is real and people in the field are affected by it, so if you don't
> >have a working alternative patch, please just let go.
> 
> I'm not denying that the problem is real. What I am concerned about
> is finding a real solution, not just putting a sticky plaster over
> the wound. It seems to me to be much wiser to deal with the issue
> properly now instead of doing extra work later to diagnose what
> might be a harder to reproduce symptom of the same problem. I'd
> happily put the time in now myself, but I simply don't have the time
> this week.
> 
> Would it be possible to apply the patch, adding some sort of new tag
> that can be used to say "This needs further attention", perhaps
> including an enduring reference to this conversation. Later, the
> 'real' fix could include another special tag that says "Proper fix
> for the symptom addressed in commit 5e94f810"?

WARN_ON() whenever patch triggers?


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2010-05-24 19:02 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-13 13:29 Is it supposed to be ok to call del_gendisk while userspace is frozen? Maxim Levitsky
2010-02-15 16:00 ` Maxim Levitsky
2010-02-15 21:04   ` Rafael J. Wysocki
2010-02-16 16:27     ` [linux-pm] " Alan Stern
2010-02-20 22:22       ` Maxim Levitsky
2010-02-23 12:33       ` Jens Axboe
2010-02-23 15:29         ` Alan Stern
2010-02-23 15:58           ` Jens Axboe
2010-02-23 16:33             ` Alan Stern
2010-02-23 22:16               ` Jens Axboe
2010-02-24 15:59                 ` Alan Stern
2010-02-24 19:12                   ` Jens Axboe
2010-02-24 20:19                     ` Alan Stern
2010-02-23 16:42             ` Testing for dirty buffers on a block device Alan Stern
2010-02-23 22:13               ` Jens Axboe
2010-02-24 15:51                 ` Alan Stern
2010-02-24 19:09                   ` Jens Axboe
2010-02-24 20:09                     ` Alan Stern
2010-02-25  8:20                       ` Jens Axboe
2010-02-25 22:19                         ` Dave Chinner
2010-03-01  6:35           ` [linux-pm] Is it supposed to be ok to call del_gendisk while userspace is frozen? Pavel Machek
2010-03-01 15:23             ` Alan Stern
2010-03-03 21:50               ` Pavel Machek
2010-03-03 22:23                 ` Alan Stern
2010-03-04  0:23                   ` Rafael J. Wysocki
2010-03-04  2:48                     ` Alan Stern
2010-03-04 19:26                       ` Rafael J. Wysocki
2010-03-04 19:36                         ` Alan Stern
2010-03-04 20:04                           ` Rafael J. Wysocki
2010-03-04 20:15                         ` Pavel Machek
2010-04-22 23:40                           ` Matt Reimer
2010-04-23  5:17                             ` Rafael J. Wysocki
2010-05-11 23:55                               ` Matt Reimer
2010-05-12 14:50                                 ` Alan Stern
2010-05-13 21:44                                   ` Matt Reimer
2010-05-13 21:54                                     ` Alan Stern
2010-05-13 22:20                                       ` Matt Reimer
2010-05-13 22:47                                         ` Nigel Cunningham
2010-05-15  2:37                                           ` Alan Stern
2010-05-15  2:53                                             ` Nigel Cunningham
2010-05-16 19:35                                               ` Rafael J. Wysocki
2010-05-15  2:32                                         ` Alan Stern
2010-05-15 20:30                                           ` Rafael J. Wysocki
2010-05-16  7:49                                             ` Nigel Cunningham
2010-05-16 19:38                                               ` Rafael J. Wysocki
2010-05-16 21:32                                                 ` Nigel Cunningham
2010-05-17  2:22                                                   ` Alan Stern
2010-05-17  7:45                                                     ` Nigel Cunningham
2010-05-17 20:35                                                       ` Rafael J. Wysocki
2010-05-17 22:51                                                         ` Nigel Cunningham
2010-05-18 19:43                                                           ` Rafael J. Wysocki
2010-05-18 20:06                                                             ` Alan Stern
2010-05-24 19:02                                                           ` Pavel Machek [this message]
2010-05-24 21:21                                                             ` Nigel Cunningham
2010-03-04 13:53                   ` Pavel Machek
2010-06-04 11:20                     ` Maxim Levitsky
2010-06-04 14:59                       ` Alan Stern
2010-06-04 15:19                         ` Maxim Levitsky
2010-06-04 17:52                           ` Alan Stern

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