Log Message:
2015-04-28 Userspace RCU 0.8.7
        * Fix: deadlock when thread join is issued in read-side C.S.
        * Fix: rename RCU_DEBUG to DEBUG_RCU in urcu-qsbr.h
        * Mark braced-groups within expressions with __extension__
        * Fix: compat_futex_noasync race condition
        * Fix: documentation: urcu-pointer.h: \ 
s/rcu_dereference_pointer/rcu_dereference/
        * Fix: call rcu should call internal RCU API