linux-kernel - Re: [PATCH v3] include/linux/skbuff.h: using '(_

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Message-Id: <20130605.013601.2203042571724866964.davem@davemloft.net>
Date:	Wed, 05 Jun 2013 01:36:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gang.chen@...anux.com
Cc:	David.Laight@...LAB.COM, andy.shevchenko@...il.com,
	edumazet@...gle.com, pshelar@...ira.com, mgorman@...e.de,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, bhutchings@...arflare.com
Subject: Re: [PATCH v3] include/linux/skbuff.h: using '(__u16) ~0U' instead
 of '~0U'

From: Chen Gang <gang.chen@...anux.com>
Date: Wed, 05 Jun 2013 08:54:22 +0800

> 
> Both 'transport_header' and 'mac_header' are __u16, which are
> never equal to '~0U'.
> 
> So need use '(__u16) ~0U' instead of '~0U'.
> 
> The related warning (with EXTRA_CFLAGS=-W ARCH=m68k for allmodconfig)
>   include/linux/skbuff.h:1587:2: warning: comparison is always true due to limited range of data type [-Wtype-limits]
>   ...
> 
> Use meaningful macro instead of hard code number, and better to
> initialize 'skb->transport_header' in __alloc_skb_head(), too.
> 
> 
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>

Your patch doesn't apply to the tree because this has been fixed already
for several days by using "typeof(x) ~0U"
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