[Patch -mm 0/3] RFC: module unloading vs. release function

[Cornelia Huck <cornelia.huck@de.ibm.com>]

Hi,

based on the discussion in "How should an exit routine wait for
release() callbacks?", I've cooked up some patches that make module
unload wait until the last reference for a kobject has been dropped.
This should plug the "release function in already deleted module" race;
however, if the last kobject_put() from the module containing the
release function is not in the module's exit function, there's still a
small window (not sure if and how to plug this).

This new refcounting still needs to be exploited (i. e. a driver
actually setting kobject->owner). Whether we need to set the owner for
kobject or if for device would be sufficient is also still open to
debate.

[1/3] Use module->mkobj even if !CONFIG_SYSFS.
[2/3] Expose module->mkobj reference count.
[3/3] Introduce kobject->owner for refcounting.

Patchset is only slightly tested, but comments are welcome :)
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