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Keep track of previously issued registrations and compare the result with MEMBARRIER_CMD_GET_REGISTRATIONS return value. Signed-off-by: Michal Clapinski <mclapinski@google.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: Paul E. McKenney <paulmck@kernel.org> Link: https://lore.kernel.org/r/20221207164338.1535591-3-mclapinski@google.com