net: implement netif_cond_dbg macro
For reporting things that may or may not be serious, depending on some condition, netif_cond_dbg will check the condition and print the report at either dbg (if the condition is true) or the specified level. Suggested-by: NJon Cooper <jcooper@solarflare.com> Signed-off-by: NEdward Cree <ecree@solarflare.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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