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rcu_barrier() is a frequently used C function which is always safe to be called. Add a safe abstraction for rcu_barrier(). Tested-by: Daniel Almeida <[email protected]> Signed-off-by: Philipp Stanner <[email protected]> Acked-by: Gary Guo <[email protected]> Reviewed-by: Onur Özkan <[email protected]> Acked-by: Danilo Krummrich <[email protected]> Link: https://patch.msgid.link/[email protected] [ Formatted documentation. Sorted tags. - Miguel ] Signed-off-by: Miguel Ojeda <[email protected]>