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On module unload call rcu_barrier(), this is needed as synchronize_rcu() is not strong enough. The kmem_cache_destroy() does invoke synchronize_rcu() but it does not provide same protection. Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk> Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>