net/packet: clarify source of pr_*() messages
Add pr_fmt macro to spell out the source of messages in prefix. Before this patch: packet size is too long (1543 > 1518) With this patch: af_packet: packet size is too long (1543 > 1518) Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
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