From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [Patch net-next] net: clean up skb headers code
Date: Tue, 28 May 2013 23:36:47 -0700 (PDT)
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From: Cong Wang <amwang@redhat.com>
Date: Wed, 29 May 2013 14:09:00 +0800

> commit 1a37e412a0225fcba5587 (net: Use 16bits for *_headers
> fields of struct skbuff) converts skb->*_header to u16,
> therefore 1) we could just use 0xFFFFF instead of (__u16) ~0U
> 2) some #if NET_SKBUFF_DATA_USES_OFFSET is useless now.
> 
> 
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Simon Horman <horms@verge.net.au>
> Signed-off-by: Cong Wang <amwang@redhat.com>

I want to use something that will either break the build or
automatically work if the type changes again.

So something like "X = (typeof(X)) ~0U;".