netdev - Re: [PATCH] bridge: only provide proxy ARP when CONFIG

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Message-ID: <CAHA+R7NfZMRMJ2=pq-VYU_FRdcCheAYu9OW6Hj9fwB0mcT7Xng@mail.gmail.com>
Date:	Tue, 13 Jan 2015 11:25:45 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Kyeyoon Park <kyeyoonp@...eaurora.org>,
	"bridge@...ts.linux-foundation.org" 
	<bridge@...ts.linux-foundation.org>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH] bridge: only provide proxy ARP when CONFIG_INET is enabled

On Tue, Jan 13, 2015 at 6:10 AM, Arnd Bergmann <arnd@...db.de> wrote:
> When IPV4 support is disabled, we cannot call arp_send from
> the bridge code, which would result in a kernel link error:
>
> net/built-in.o: In function `br_handle_frame_finish':
> :(.text+0x59914): undefined reference to `arp_send'
> :(.text+0x59a50): undefined reference to `arp_tbl'
>
> This makes the newly added proxy ARP support in the bridge
> code depend on the CONFIG_INET symbol and lets the compiler
> optimize the code out to avoid the link error.
>

Not sure how much sense to make CONFIG_BRIDGE depend
on CONFIG_INET, at least CONFIG_BONDING does.
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