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67d676bb13
Currently there is no primitive for retrieving the previous list member. To do this we need a new deletion primitive that doesn't poison the prev pointer and a corresponding retrieval helper. Note that it is not valid to ues both list_del_rcu() and list_bidir_del_rcu() on the same list. Link: https://lore.kernel.org/r/20241213-work-mount-rbtree-lockless-v3-4-6e3cdaf9b280@kernel.org Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Jeff Layton <jlayton@kernel.org> Suggested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>