linux-kernel - Re: [RFC] configfs: module reference counting rules

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Message-ID: <20080616193614.GB6441@mail.oracle.com>
Date:	Mon, 16 Jun 2008 12:36:14 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Louis Rilling <Louis.Rilling@...labs.com>
Cc:	ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] configfs: module reference counting rules

On Mon, Jun 16, 2008 at 08:14:28PM +0200, Louis Rilling wrote:
> With a preemptible kernel, after module_put(self) the few assembly instructions
> cleaning up the stack before returning to the caller can be called after the
> memory allocated for the module has been freed. Which will make the kernel
> crash.

	Ahh, but if you are running a preemptible kernel, you've already
made your first mistake :-)

Joel

-- 

"Vote early and vote often." 
        - Al Capone

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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