slab: overloading the RCU head over the LRU for RCU free

With build-time size checking, we can overload the RCU head over the LRU
of struct page to free pages of a slab in rcu context. This really help to
implement to overload the struct slab over the struct page and this
eventually reduce memory usage and cache footprint of the SLAB.

Acked-by: Andi Kleen <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Joonsoo Kim <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>

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