Log Message:
Userspace RCU 0.7.6
* Discourage use of pthread_atfork() for call_rcu handlers
* Fix call_rcu fork handling
* test: fork handling
* Fix TLS detection: test with linker, add --disable-compiler-tls
* Cleanup: cast pthread_self() return value to unsigned long
* Fallback mechanism not working on platform where TLS is unsupported