RCU - read side

The basic RCU read-side interface is:

#include <linux/rcupdate.h>

struct my_stuff *stuff;

rcu_read_lock();
    stuff = find_the_stuff(...);
    do_something_with(stuff);
    /* Everything here is atomic */
rcu_read_unlock();

Some problems:
Preemption is disabled
No indication of what is being protected