Get rid of these debug counters.  Since they're no longer necessarily
incremented under state lock, we'd need to convert them to atomic_t to
guarantee them correct.  It doesn't seem worth it.

Also, the debug checks in kmem_cache_destroy() should be sufficient for at
least one of the purposes the debugging counters existed for--we'll get a
dump_stack() if there are still stateowners left when we shut down.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>