Provide a helper to traverse an RCU-protected doubly linked list in the reverse
order. Also add a corresponding helper to delete entries from the linked list,
which takes care to see that we don't poison either of the pointers (->prev
and ->next), since it is legal to run an rcu list-traversal
Provide a helper to traverse an RCU-protected doubly linked list in the reverse
order. Also add a corresponding helper to delete entries from the linked list,
which takes care to see that we don't poison either of the pointers (-prev
and -next), since it is legal to run an rcu list-traversal
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