netdev - Re: [PATCH 1/1] net: rtnetlink.h -- only include linux/netdevice.h when used by the kernel

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Date:	Mon, 15 Nov 2010 11:30:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	apw@...onical.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tim.gardner@...onical.com
Subject: Re: [PATCH 1/1] net: rtnetlink.h -- only include linux/netdevice.h
 when used by the kernel

From: Andy Whitcroft <apw@...onical.com>
Date: Mon, 15 Nov 2010 16:01:59 +0000

> The commit below added a new helper dev_ingress_queue to cleanly obtain the
> ingress queue pointer.  This necessitated including 'linux/netdevice.h':
 ...
> However this include triggers issues for applications in userspace
> which use the rtnetlink interfaces.  Commonly this requires they include
> 'net/if.h' and 'linux/rtnetlink.h' leading to a compiler error as below:
> 
>   In file included from /usr/include/linux/netdevice.h:28:0,
>                    from /usr/include/linux/rtnetlink.h:9,
>                    from t.c:2:
>   /usr/include/linux/if.h:135:8: error: redefinition of ‘struct ifmap’
>   /usr/include/net/if.h:112:8: note: originally defined here
>   /usr/include/linux/if.h:169:8: error: redefinition of ‘struct ifreq’
>   /usr/include/net/if.h:127:8: note: originally defined here
>   /usr/include/linux/if.h:218:8: error: redefinition of ‘struct ifconf’
>   /usr/include/net/if.h:177:8: note: originally defined here
> 
> The new helper is only defined for the kernel and protected by __KERNEL__
> therefore we can simply pull the include down into the same protected
> section.
> 
> Signed-off-by: Andy Whitcroft <apw@...onical.com>

Applied, thanks Andy.