Re: (remove) event not supported.

[David Brownell <david-b@pacbell.net>]

> >I'd hate to change the semantics of the "use" count (which is really
> >used as "open" count)
> 
> No, the module use count is a reference count on the module, not an
> open count. 

It's not a reference count, since it doesn't address the case where
another module references it ... "rmmod" uses additional magic
to handle such dependency cases.  Since the counter can be (as
you highlighted!) updated at any time, there's nothing to make it
be a "reference" count.  The networking framework is pretty explicit
that it must be used as an "open" count (SET_MODULE_OWNER
arranges this).

Perhaps the best way to describe this counter is that it's there,
and "rmmod" won't remove modules where it's nonzero.  (Or
has never been nonzero...)  Which doesn't seem to accomodate
the needs of a hotplug-oriented world.

- Dave




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