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netfilter: Remove now-redundant smp_read_barrier_depends()
READ_ONCE() now implies smp_read_barrier_depends(), which means that the instances in arpt_do_table(), ipt_do_table(), and ip6t_do_table() are now redundant. This commit removes them and adjusts the comments. Signed-off-by: Paul E. McKenney <[email protected]> Cc: Pablo Neira Ayuso <[email protected]> Cc: Jozsef Kadlecsik <[email protected]> Cc: Florian Westphal <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: <[email protected]>
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