linux-kernel - Re: [PATCH 1/4] module: implement module_inhibit

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Message-Id: <1190677332.27805.229.camel@localhost.localdomain>
Date:	Tue, 25 Sep 2007 09:42:12 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jonathan Corbet <corbet@....net>, ebiederm@...ssion.com,
	cornelia.huck@...ibm.com, greg@...ah.com,
	stern@...land.harvard.edu, kay.sievers@...y.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] module: implement module_inhibit_unload()

On Tue, 2007-09-25 at 08:18 +0900, Tejun Heo wrote:
> > Given your description of this tool as a "sledgehammer," might it not be
> > easier to just take and hold module_mutex for the duration of the unload
> > block?
> 
> That would be easier but...
> 
> * It would serialize users of the sledgehammer.
> * It would block loading modules (which is often more important than
> unloading them) when things go south.

My concern is that you're dropping the module mutex around ->exit now.
I don't *think* this should matter, but it's worth considering.

I really wonder if an explicit "kill_this_attribute()" is a better way
to go than this...

Rusty.

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