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greybus: loopback: graph round-trip time for all threads
This patch adds the ability to time the delta between all threads like this
t1 = timestmap();
thread1:gb_operation_sync();
thread2:gb_operation_sync();
t2 = timestamp();
In order to enable that behaviour without forcing an undesirable
checkpointing scheme this patch introduces a kfifo for each thread to store
the raw timestamps and calculate a time difference.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>