On Mon, 2 Dec 2013, Greg KH wrote:

quoted

We need our own reference count. So we just have to defer the
release of the kmem_cache struct until the ->release callback is
triggered. The put of the embedded kobject must be the last action on the
kmem_cache  structure which will then trigger release and that will
trigger the kmem_cache_free().

Ok, that sounds reasonable, or you can just create a "tiny" structure
for the kobject that has a pointer back to your kmem_cache structure
that you can then reference from the show/store functions.  Either is
fine with me.

Problem is that the release field is only available if
CONFIG_DEBUG_KOBJECT_RELEASE is enabled. Without the callback I cannot
tell when it is legit to release the kobject structure unless I keep
scanning it once in awhile.


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