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2008-11-16rcu: documents rculist_nullsEric Dumazet
Adds Documentation/RCU/rculist_nulls.txt file to describe how 'nulls' end-of-list can help in some RCU algos. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: David S. Miller <davem@davemloft.net>