[PATCH -mm 0/6] rcu: introduce kfree_rcu V2

[Lai Jiangshan]

There are 23 instances where the rcu callback just does

	kfree(containerof(head,struct whatever_struct,rcu_member));

The 23 instances exist because there are 23 'struct whatever_struct' with
their individual rcu_member. These patches creates a generic kfree_rcu()
function that removes the need for these 23 helpers.

The number of this kind of rcu callback will increase, for this is the
most common way to use rcu and define rcu callback.

And kfree_rcu() is also help for unloadable modules, kfree_rcu() does not
queue any function which belong to the module, so a rcu_barrier() can
be avoid when module exit. (If we queue any other function by call_rcu(),
rcu_barrier() is still needed.)

Changed from V1:
1) Implement kfree_rcu() in slab layer.
   In V1, the offset from the container struct to the rcu member
   is calculated at compile time and stored in head->func instead of the
   function pointer. This disarrange rcu's algorithm a little, there is
   no bad side effect when we implement kfree_rcu() in slab layer.

2) kfree_rcu() API is changed, use the version that Manfred Spraul designed.
   This one allows compiler do more checking.

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
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