x86_64: csum_add for x86_64

Add csum_add function for x86_64.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-05-02 16:28:15 -07:00 • committed by David S. Miller
commit a278534406