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From:   Keith Owens <kaos@ocs.com.au>
To:     Andrew Morton <andrewm@uow.edu.au>
cc:     "netdev@oss.sgi.com" <netdev@oss.sgi.com>
Subject: Re: modular net drivers, take 2 
In-reply-to: Your message of "Wed, 21 Jun 2000 04:45:19 GMT."
             <3950485F.AD6F58C6@uow.edu.au> 
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Date:   Wed, 21 Jun 2000 15:16:24 +1000
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On Wed, 21 Jun 2000 04:45:19 +0000, 
Andrew Morton <andrewm@uow.edu.au> wrote:
>Plan M:
>
>sys_delete_module() doesn't do the vfree().  It schedules it for 5
>seconds in the future.  Or provides a mechanism for userland to do this.

Does not fix the problem where module open() code is running at the
same time as module_exit() code which tears down the kernel structures
that open needs.  Freeing the code pages while they are in use is only
one of the possible failure modes for this race.