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This commit adds the get_completed_synchronize_srcu() and the same_state_synchronize_srcu() functions. The first returns a cookie that is always interpreted as corresponding to an expired grace period. The second does an equality comparison of a pair of cookies. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Kent Overstreet <kent.overstreet@linux.dev>