From: Eric Dumazet <eric.duma...@gmail.com>
Date: Fri, 03 Jul 2015 07:00:23 +0200

> tcp_skb_cb is currently 44 bytes, so even if you add one u32, it should
> not exceed cb[]

Please see sock_skb_cb, which consumes space in skb->cb[] in parallel
with things like tcp_skb_cb.  The usage of skb->cb[] therefore really
is 48 bytes and I'm sure the build time assertions triggered if
Lawrence added the new tcp_skb_cb member without first increasing it's
size.
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