netdev - Re: [Patch net-next] net: clean up skb headers code

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Message-ID: <1369856073.1971.2.camel@bwh-desktop.uk.level5networks.com>
Date:	Wed, 29 May 2013 20:34:33 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
CC:	<amwang@...hat.com>, <netdev@...r.kernel.org>, <horms@...ge.net.au>
Subject: Re: [Patch net-next] net: clean up skb headers code

On Tue, 2013-05-28 at 23:36 -0700, David Miller wrote:
> From: Cong Wang <amwang@...hat.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@...emloft.net>
> > Cc: Simon Horman <horms@...ge.net.au>
> > Signed-off-by: Cong Wang <amwang@...hat.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;".

I think you mean ~(typeof(X))0.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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