rculist allows concurrent lockless list iteration, while a writer may
be modifying the list. Multiple writers can be supported by using a
mutex in addition to rculist.
First user will be added in a following patch.
Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
