linux-kernel - Re: [linux-pm] Is it supposed to be ok to call del

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Message-ID: <4BFAEDC9.1010707@crca.org.au>
Date:	Tue, 25 May 2010 07:21:13 +1000
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Pavel Machek <pavel@....cz>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	Matt Reimer <mattjreimer@...il.com>
Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while
 userspace is frozen?

Hi.

On 25/05/10 05:02, Pavel Machek wrote:
>
>>>> - 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?

I suppose that would do. I was thinking of a more generic git tag that 
could perhaps be searched for later, but .. okay.

Nigel
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