call_rcu_after_fork_parent() after the fork(). The child
process must invoke call_rcu_after_fork_child().
These three APIs are suitable for passing to pthread_atfork().
+
+Thread Local Storage (TLS)
+
+ Userspace RCU can fall back on pthread_getspecific() to emulate
+ TLS variables on systems where it is not available. This behavior
+ can be forced by specifying --disable-compiler-tls as configure
+ argument.