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Date: Wed, 3 Jul 2002 05:50:13 +0200
From: Pavel Machek <pavel@ucw.cz>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Werner Almesberger <wa@almesberger.net>, Keith Owens <kaos@ocs.com.au>,
       linux-kernel@vger.kernel.org
Subject: Re: [OKS] Module removal
Message-ID: <20020703035013.GJ474@elf.ucw.cz>
References: <20020702133658.I2295@almesberger.net> <20020702165019.29700@smtp.adsl.oleane.com>
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Hi!

> >> It's not really just the module information. If I can, say, get
> >> callbacks from something even after I unregister, I may well
> >> have destroyed the data I need to process the callbacks, and
> >> oops or worse.
> >
> >Actually, if module exit synchronizes properly, even the
> >return-after-removal case shouldn't exist, because we'd simply
> >wait for this call to return.
> >
> >Hmm, interesting. Did I just make the whole problem go away,
> >or is travel fatigue playing tricks on my brain ? :-)
> 
> That was one of the solutions proposed by Rusty, that is basically
> waiting for all CPUs to have scheduled upon exit from module_exit
> and before doing the actual removal.

That seems reasonable... lighter version of freeze_processes() I was
thinking about.
								Pavel
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