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2019-07-01blackhole_dev: add a selftestMahesh Bandewar1-0/+100
Since this is not really a device with all capabilities, this test ensures that it has *enough* to make it through the data path without causing unwanted side-effects (read crash!). Signed-off-by: Mahesh Bandewar <[email protected]> Signed-off-by: David S. Miller <[email protected]>