Andrew Morton wrote:

>The pointer offsetting tricks are rather unattractive.  Is it not possible
>to simple aggregate the refcount into the refcounted structure, use
>container_of()?
>  
>
Patch attached: it worked quite well and I've used the chance to reduce 
the size of the vmalloc header a bit: the work_struct and the rcu_head 
structures can be a union.

Signed-Off-By: Manfred Spraul <manfred@colorfullife.com>