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ntb_pingpong: Add a debugfs file to get the ping count
This commit adds a debugfs 'count' file to ntb_pingpong. This is so testing with ntb_pingpong can be automated beyond just checking the logs for pong messages. The count file returns a number which increments every pong. The counter can be cleared by writing a zero. Signed-off-by: Logan Gunthorpe <[email protected]> Acked-by: Allen Hubbe <[email protected]> Signed-off-by: Jon Mason <[email protected]>
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