From abc5d1ff3e8f9b4a9d274818459b123e31981dc9 Mon Sep 17 00:00:00 2001
From: Tom Herbert <tom@herbertland.com>
Date: Mon, 17 Aug 2015 13:42:26 -0700
Subject: [PATCH] net: Add inet_proto_csum_replace_by_diff utility function

This function updates a checksum field value and skb->csum based on
a value which is the difference between the old and new checksum.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Reading git-format-patch failed