srcu_init_notifier_head — Initialize an SRCU notifier head
Pointer to head of the srcu notifier chain
Unlike other sorts of notifier heads, SRCU notifier heads require dynamic initialization. Be sure to call this routine before calling any of the other SRCU notifier routines for this head.
If an SRCU notifier head is deallocated, it must first be cleaned up by calling srcu_cleanup_notifier_head. Otherwise the head's per-cpu data (used by the SRCU mechanism) will leak.