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TCP packets all have writable heads, that is, even though it's cloned, it is
writable up to the end of the TCP header. This patch makes skb_checksum_help
aware of this fact by using skb_clone_writable and avoiding a copy for TCP.
I've also modified the BUG_ON tests to be unsigned. The only case where this
makes a difference is if csum_start points to a location before skb->data.
Since skb->data should always include the header where the checksum field
is (and all currently callers adhere to that), this change is safe and may
uncover bugs later.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
a030847e9f