some other synchronization mechanism, for example, reference
counting.
<li> In kernels built with <tt>CONFIG_RCU_TRACE=y</tt>, RCU-related
- information is provided via both debugfs and event tracing.
+ information is provided via event tracing.
<li> Open-coded use of <tt>rcu_assign_pointer()</tt> and
<tt>rcu_dereference()</tt> to create typical linked
data structures can be surprisingly error-prone.