Messages in this thread |  | | From | Keith Owens <> | Subject | Re: [OKS] Module removal | Date | Thu, 04 Jul 2002 10:00:19 +1000 |
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On Thu, 4 Jul 2002 00:26:36 +0200, Diego Calleja <diegocg@teleline.es> wrote: >On Tue, 2 Jul 2002 17:50:19 -0400 (EDT) >Ryan Anderson <ryan@michonline.com> escribió: > >> In a single processor, no preempt kernel, there is no race. >> Turn on SMP or preempt and there is one. > >So we _can't_ talk about remove module removal, but _disabling_ module >removal in the worst case. > >Because if the above is correct, single processors without preempt works >well and can use module removal safely...
Module removal is not safe even on UP without preempt. UP with no preempt only removes this race
Read usecount Enter module Increment usecount Check usecount == 0 Clean up module
There are other race conditions on module unload, which is why the problem is so "interesting".
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