[PATCH 0/4] rcu: don't assume the size of struct rcu_head

We always keep the struct rcu_head very small, but we may change it in future
or under some CONFIGs.

There are some other systems may assume the size of struct rcu_head as 2 * sizeof(long).
These assumptions obstruct us to add debug information or priority information
to struct rcu_head. It is time to fix them.

It is glad that I just find 3 places which need to be fixed. These 4 patches
are just cleanup patches when the size of struct rcu_head == 2 * sizeof(long).
NO overhead added and NO behavior changed.
Even when the size of struct rcu_head becomes larger, only slub is changed a little.

Signed-off-by: Lai Jiangshan <redacted>
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